diff --git a/.cmake-format.py b/.cmake-format.py
new file mode 100644
index 00000000..2a46b909
--- /dev/null
+++ b/.cmake-format.py
@@ -0,0 +1,3 @@
+tab_size = 4
+enable_sort = True
+autosort = True
diff --git a/.github/workflows/appimage.yml b/.github/workflows/appimage.yml
index 54046d33..cb599308 100644
--- a/.github/workflows/appimage.yml
+++ b/.github/workflows/appimage.yml
@@ -32,11 +32,11 @@ jobs:
           # install EnTT
           git clone https://github.com/skypjack/entt.git
           cd entt/build
-          cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo ..
+          cmake -DCMAKE_BUILD_TYPE=Release ..
           sudo make install
           cd ../..
       - name: Configure
-        run: cmake -S . -B build -DCMAKE_BUILD_TYPE=RelWithDebInfo -DVOXELENGINE_BUILD_APPDIR=1 -DVOXELENGINE_BUILD_TESTS=ON
+        run: cmake -S . -B build -DCMAKE_BUILD_TYPE=Release -DVOXELENGINE_BUILD_APPDIR=1 -DVOXELENGINE_BUILD_TESTS=ON
       - name: Build
         run: cmake --build build -t install
       - name: Run tests
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4b5c6fc8..abfd430e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,18 +8,20 @@ set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
-if (CMAKE_SYSTEM_NAME STREQUAL "Windows")
-  # We use two types linking: for clang build is static (vcpkg triplet x64-windows-static)
-  # and for msvc build is dynamic linking (vcpkg triplet x64-windows)
-  # By default CMAKE_MSVC_RUNTIME_LIBRARY set by MultiThreaded$<$<CONFIG:Debug>:Debug>DLL
-  if (VCPKG_TARGET_TRIPLET MATCHES "static")
-    set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
-  endif()
+if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
+    # We use two types linking: for clang build is static (vcpkg triplet
+    # x64-windows-static) and for msvc build is dynamic linking (vcpkg triplet
+    # x64-windows) By default CMAKE_MSVC_RUNTIME_LIBRARY set by
+    # MultiThreaded$<$<CONFIG:Debug>:Debug>DLL
+    if(VCPKG_TARGET_TRIPLET MATCHES "static")
+        set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
+    endif()
 endif()
 
 add_subdirectory(src)
 add_executable(${PROJECT_NAME} src/main.cpp)
-target_include_directories(${PROJECT_NAME} PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src)
+target_include_directories(${PROJECT_NAME}
+                           PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src)
 
 if(VOXELENGINE_BUILD_APPDIR)
     include(${CMAKE_CURRENT_SOURCE_DIR}/dev/cmake/BuildAppdir.cmake)
@@ -27,33 +29,44 @@ endif()
 
 if(MSVC)
     if(NOT CMAKE_BUILD_TYPE)
-      set(CMAKE_BUILD_TYPE Release CACHE STRING "Build type" FORCE)
+        set(CMAKE_BUILD_TYPE
+            Release
+            CACHE STRING "Build type" FORCE)
     endif()
-    if((CMAKE_BUILD_TYPE EQUAL "Release") OR (CMAKE_BUILD_TYPE EQUAL "RelWithDebInfo"))
-      target_compile_options(${PROJECT_NAME} PRIVATE /W4 /MT /O2)
+    if((CMAKE_BUILD_TYPE EQUAL "Release") OR (CMAKE_BUILD_TYPE EQUAL
+                                              "RelWithDebInfo"))
+        target_compile_options(${PROJECT_NAME} PRIVATE /W4 /MT /O2)
     else()
-      target_compile_options(${PROJECT_NAME} PRIVATE /W4)
+        target_compile_options(${PROJECT_NAME} PRIVATE /W4)
     endif()
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /source-charset:UTF-8 /D_DISABLE_CONSTEXPR_MUTEX_CONSTRUCTOR")
+    set(CMAKE_CXX_FLAGS
+        "${CMAKE_CXX_FLAGS} /source-charset:UTF-8 /D_DISABLE_CONSTEXPR_MUTEX_CONSTRUCTOR"
+    )
 else()
-  target_compile_options(${PROJECT_NAME} PRIVATE -Wall -Wextra
-    # additional warnings
-    -Wformat-nonliteral -Wcast-align
-    -Wpointer-arith -Wundef
-    -Wwrite-strings -Wno-unused-parameter)
-  if (CMAKE_BUILD_TYPE MATCHES "Debug")
-    target_compile_options(${PROJECT_NAME} PRIVATE -Og)
-  endif()
-  if (WIN32)
-    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -static")
-  endif()
+    target_compile_options(
+        ${PROJECT_NAME}
+        PRIVATE -Wall
+                -Wextra
+                # additional warnings
+                -Wformat-nonliteral
+                -Wcast-align
+                -Wpointer-arith
+                -Wundef
+                -Wwrite-strings
+                -Wno-unused-parameter)
+    if(CMAKE_BUILD_TYPE MATCHES "Debug")
+        target_compile_options(${PROJECT_NAME} PRIVATE -Og)
+    endif()
+    if(WIN32)
+        set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -static")
+    endif()
 endif()
 
-if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
     set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -no-pie -lstdc++fs")
 endif()
 
-if (WIN32)
+if(WIN32)
     target_link_libraries(${PROJECT_NAME} VoxelEngineSrc winmm)
 endif()
 
@@ -61,14 +74,13 @@ target_link_libraries(${PROJECT_NAME} VoxelEngineSrc ${CMAKE_DL_LIBS})
 
 # Deploy res to build dir
 add_custom_command(
-  TARGET ${PROJECT_NAME} 
-  POST_BUILD 
-  COMMAND ${CMAKE_COMMAND} -E copy_directory_if_different 
-          ${CMAKE_CURRENT_SOURCE_DIR}/res 
-          $<TARGET_FILE_DIR:${PROJECT_NAME}>/res
-  )
+    TARGET ${PROJECT_NAME}
+    POST_BUILD
+    COMMAND
+        ${CMAKE_COMMAND} -E copy_directory_if_different
+        ${CMAKE_CURRENT_SOURCE_DIR}/res $<TARGET_FILE_DIR:${PROJECT_NAME}>/res)
 
-if (VOXELENGINE_BUILD_TESTS)
+if(VOXELENGINE_BUILD_TESTS)
     enable_testing()
     add_subdirectory(test)
 endif()
diff --git a/dev/tests/world.lua b/dev/tests/world.lua
index db1ffca5..cd9c21c3 100644
--- a/dev/tests/world.lua
+++ b/dev/tests/world.lua
@@ -5,6 +5,7 @@ app.reconfig_packs({"base"}, {})
 app.new_world("demo", "2019", "core:default")
 assert(world.is_open())
 assert(world.get_generator() == "core:default")
+assert(app.is_content_loaded())
 app.sleep(1)
 assert(world.get_total_time() > 0.0)
 print(world.get_total_time())
@@ -12,6 +13,7 @@ print(world.get_total_time())
 -- Close
 app.close_world(true)
 assert(not world.is_open())
+assert(not app.is_content_loaded())
 
 -- Reopen
 app.open_world("demo") 
diff --git a/doc/en/scripting/builtins/libapp.md b/doc/en/scripting/builtins/libapp.md
index e3fed3d4..ffc4d923 100644
--- a/doc/en/scripting/builtins/libapp.md
+++ b/doc/en/scripting/builtins/libapp.md
@@ -69,6 +69,12 @@ app.config_packs(
 Updates the packs configuration, automatically removing unspecified ones, adding those missing in the previous configuration.
 Uses app.reconfig_packs.
 
+```lua
+app.is_content_loaded() -> bool
+```
+
+Checks if content is loaded.
+
 ```lua
 app.new_world(
     -- world name
diff --git a/doc/en/scripting/builtins/libworld.md b/doc/en/scripting/builtins/libworld.md
index fc18773e..97c6fdee 100644
--- a/doc/en/scripting/builtins/libworld.md
+++ b/doc/en/scripting/builtins/libworld.md
@@ -47,4 +47,18 @@ world.is_night() -> bool
 
 -- Returns the total number of chunks loaded into memory
 world.count_chunks() -> int
+
+-- Returns the compressed chunk data to send.
+-- Currently includes:
+-- 1. Voxel data (id and state)
+-- 2. Voxel metadata (fields)
+world.get_chunk_data(x: int, z: int) -> Bytearray
+
+-- Modifies the chunk based on the compressed data.
+-- Returns true if the chunk exists.
+world.set_chunk_data(
+    x: int, z: int,
+    -- compressed chunk data
+    data: Bytearray
+) -> bool
 ```
diff --git a/doc/en/scripting/events.md b/doc/en/scripting/events.md
index cc820898..21e1cee5 100644
--- a/doc/en/scripting/events.md
+++ b/doc/en/scripting/events.md
@@ -126,6 +126,34 @@ function on_block_interact(blockid, x, y, z, playerid) -> bool
 
 Called on block RMB click interaction. Prevents block placing if **true** returned.
 
+### Chunk Events (world.lua)
+
+```lua
+function on_chunk_present(x: int, z: int, loaded: bool)
+```
+
+Called after a chunk is generated/loaded. If a previously saved chunk is loaded, `loaded` will be true.
+
+```lua
+function on_chunk_remove(x: int, z: int)
+```
+
+Called when a chunk is unloaded from the world.
+
+### Inventory Events (world.lua)
+
+```lua
+function on_inventory_open(invid: int, playerid: int)
+```
+
+Called when the inventory is opened. If the inventory was not opened directly by the player, playerid will be -1.
+
+```lua
+function on_inventory_closed(invid: int, playerid: int)
+```
+
+Called when the inventory is closed.
+
 ## Layout events
 
 Script *layouts/layout_name.xml.lua* events.
diff --git a/doc/ru/scripting/builtins/libapp.md b/doc/ru/scripting/builtins/libapp.md
index 7887bcdf..c0f3b741 100644
--- a/doc/ru/scripting/builtins/libapp.md
+++ b/doc/ru/scripting/builtins/libapp.md
@@ -69,6 +69,12 @@ app.config_packs(
 Обновляет конфигурацию паков, автоматически удаляя лишние, добавляя отсутствующие в прошлой конфигурации.
 Использует app.reconfig_packs.
 
+```lua
+app.is_content_loaded() -> bool
+```
+
+Проверяет, загружен ли контент.
+
 ```lua
 app.new_world(
     -- название мира
diff --git a/doc/ru/scripting/builtins/libworld.md b/doc/ru/scripting/builtins/libworld.md
index 0467d784..a7e0e5a6 100644
--- a/doc/ru/scripting/builtins/libworld.md
+++ b/doc/ru/scripting/builtins/libworld.md
@@ -46,4 +46,18 @@ world.is_night() -> bool
 
 -- Возвращает общее количество загруженных в память чанков
 world.count_chunks() -> int
+
+-- Возвращает сжатые данные чанка для отправки.
+-- На данный момент включает:
+-- 1. Данные вокселей (id и состояние)
+-- 2. Метаданные (поля) вокселей
+world.get_chunk_data(x: int, z: int) -> Bytearray
+
+-- Изменяет чанк на основе сжатых данных.
+-- Возвращает true если чанк существует.
+world.set_chunk_data(
+    x: int, z: int,
+    -- сжатые данные чанка
+    data: Bytearray
+) -> bool
 ```
diff --git a/doc/ru/scripting/events.md b/doc/ru/scripting/events.md
index a5cc3e72..c7781879 100644
--- a/doc/ru/scripting/events.md
+++ b/doc/ru/scripting/events.md
@@ -126,6 +126,35 @@ function on_block_interact(blockid, x, y, z, playerid) -> bool
 
 Вызывается при нажатии на блок ПКМ. Предотвращает установку блоков, если возвращает `true`
 
+### События чанков (world.lua)
+
+```lua
+function on_chunk_present(x: int, z: int, loaded: bool)
+```
+
+Вызывается после генерации/загрузки чанка. В случае загрузки ранее сохраненного чанка `loaded` будет истинным.
+
+```lua
+function on_chunk_remove(x: int, z: int)
+```
+
+Вызывается при выгрузке чанка из мира.
+
+### События инвентарей (world.lua)
+
+```lua
+function on_inventory_open(invid: int, playerid: int)
+```
+
+Вызывается при открытии инвентаря. Если инвентарь был открыт не напрямую игроком, playerid будет равен -1.
+
+```lua
+function on_inventory_closed(invid: int, playerid: int)
+```
+
+Вызывается при закрытии инвентаря.
+
+
 ## События макета
 
 События прописываются в файле `layouts/имя_макета.xml.lua`.
diff --git a/res/config/bindings.toml b/res/config/bindings.toml
index 426a580f..27f02342 100644
--- a/res/config/bindings.toml
+++ b/res/config/bindings.toml
@@ -19,3 +19,4 @@ player.pick="mouse:middle"
 player.drop="key:q"
 player.fast_interaction="key:x"
 hud.inventory="key:tab"
+hud.chat="key:t"
diff --git a/res/scripts/stdlib.lua b/res/scripts/stdlib.lua
index f376e210..c9f38835 100644
--- a/res/scripts/stdlib.lua
+++ b/res/scripts/stdlib.lua
@@ -39,6 +39,7 @@ local function complete_app_lib(app)
     app.get_setting_info = core.get_setting_info
     app.load_content = core.load_content
     app.reset_content = core.reset_content
+    app.is_content_loaded = core.is_content_loaded
     
     function app.config_packs(packs_list)
         -- Check if packs are valid and add dependencies to the configuration
@@ -376,6 +377,14 @@ function __vc_on_hud_open()
             hud.show_overlay("core:console", false, {"console"})
         end)
     end)
+    input.add_callback("hud.chat", function()
+        if hud.is_paused() then
+            return
+        end
+        time.post_runnable(function()
+            hud.show_overlay("core:console", false, {"chat"})
+        end)
+    end)
 end
 
 local RULES_FILE = "world:rules.toml"
diff --git a/res/texts/en_US.txt b/res/texts/en_US.txt
index e9b23897..732e2d66 100644
--- a/res/texts/en_US.txt
+++ b/res/texts/en_US.txt
@@ -33,6 +33,7 @@ movement.sprint=Sprint
 movement.crouch=Crouch
 movement.cheat=Cheat
 hud.inventory=Inventory
+hud.chat=Chat
 player.pick=Pick Block
 player.attack=Attack
 player.destroy=Destroy
diff --git a/res/texts/ru_RU.txt b/res/texts/ru_RU.txt
index d3c40893..80a7ba6a 100644
--- a/res/texts/ru_RU.txt
+++ b/res/texts/ru_RU.txt
@@ -103,6 +103,7 @@ movement.sprint=Ускорение
 movement.crouch=Красться
 movement.cheat=Чит
 hud.inventory=Инвентарь
+hud.chat=Чат
 player.pick=Подобрать Блок
 player.attack=Атаковать
 player.destroy=Сломать
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 6350f4b8..09d3d0c8 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -10,7 +10,7 @@ add_library(${PROJECT_NAME} STATIC ${SOURCES} ${HEADERS})
 
 find_package(OpenGL REQUIRED)
 find_package(GLEW REQUIRED)
-if (CMAKE_SYSTEM_NAME STREQUAL "Windows")
+if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
     # specific for vcpkg
     find_package(OpenAL CONFIG REQUIRED)
     set(OPENAL_LIBRARY OpenAL::OpenAL)
@@ -20,17 +20,19 @@ endif()
 find_package(ZLIB REQUIRED)
 find_package(PNG REQUIRED)
 find_package(CURL REQUIRED)
-if (NOT APPLE)
+if(NOT APPLE)
     find_package(EnTT REQUIRED)
 endif()
 
 set(LIBS "")
 
-if (CMAKE_SYSTEM_NAME STREQUAL "Windows")
-    # Use directly linking to lib instead PkgConfig (because pkg-config dont install on windows as default) 
-    # TODO: Do it with findLua.
-    if (MSVC)
-        set(LUA_INCLUDE_DIR "$ENV{VCPKG_ROOT}/packages/luajit_${VCPKG_TARGET_TRIPLET}/include/luajit")
+if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
+    # Use directly linking to lib instead PkgConfig (because pkg-config dont
+    # install on windows as default) TODO: Do it with findLua.
+    if(MSVC)
+        set(LUA_INCLUDE_DIR
+            "$ENV{VCPKG_ROOT}/packages/luajit_${VCPKG_TARGET_TRIPLET}/include/luajit"
+        )
         find_package(Lua REQUIRED)
     else()
         # Used for mingw-clang cross compiling from msys2
@@ -49,7 +51,7 @@ elseif(APPLE)
     set(LUA_LIBRARIES "/opt/homebrew/lib/libluajit-5.1.a")
     message(STATUS "LUA Libraries: ${LUA_LIBRARIES}")
     message(STATUS "LUA Include Dir: ${LUA_INCLUDE_DIR}")
-    
+
     set(VORBISLIB ${VORBIS_LDFLAGS})
     message(STATUS "Vorbis Lib: ${VORBIS_LDFLAGS}")
 else()
@@ -70,4 +72,16 @@ endif()
 include_directories(${LUA_INCLUDE_DIR})
 include_directories(${CURL_INCLUDE_DIR})
 target_include_directories(${PROJECT_NAME} PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
-target_link_libraries(${PROJECT_NAME} ${LIBS} glfw OpenGL::GL ${OPENAL_LIBRARY} GLEW::GLEW ZLIB::ZLIB PNG::PNG CURL::libcurl ${VORBISLIB} ${LUA_LIBRARIES} ${CMAKE_DL_LIBS})
+target_link_libraries(
+    ${PROJECT_NAME}
+    ${LIBS}
+    glfw
+    OpenGL::GL
+    ${OPENAL_LIBRARY}
+    GLEW::GLEW
+    ZLIB::ZLIB
+    PNG::PNG
+    CURL::libcurl
+    ${VORBISLIB}
+    ${LUA_LIBRARIES}
+    ${CMAKE_DL_LIBS})
diff --git a/src/content/ContentPack.hpp b/src/content/ContentPack.hpp
index c8e0de9b..e4360bdc 100644
--- a/src/content/ContentPack.hpp
+++ b/src/content/ContentPack.hpp
@@ -109,6 +109,10 @@ struct WorldFuncsSet {
     bool onblockbroken;
     bool onblockinteract;
     bool onplayertick;
+    bool onchunkpresent;
+    bool onchunkremove;
+    bool oninventoryopen;
+    bool oninventoryclosed;
 };
 
 class ContentPackRuntime {
diff --git a/src/engine/ServerMainloop.cpp b/src/engine/ServerMainloop.cpp
index eb570e7b..b97919be 100644
--- a/src/engine/ServerMainloop.cpp
+++ b/src/engine/ServerMainloop.cpp
@@ -70,7 +70,7 @@ void ServerMainloop::run() {
             begin = system_clock::now();
         }
     }
-    logger.info() << "test finished";
+    logger.info() << "script finished";
 }
 
 void ServerMainloop::setLevel(std::unique_ptr<Level> level) {
diff --git a/src/frontend/hud.cpp b/src/frontend/hud.cpp
index 3bf7cab2..01798503 100644
--- a/src/frontend/hud.cpp
+++ b/src/frontend/hud.cpp
@@ -413,6 +413,7 @@ std::shared_ptr<Inventory> Hud::openInventory(
     }
     secondInvView->bind(inv, &content);
     add(HudElement(hud_element_mode::inventory_bound, doc, secondUI, false));
+    scripting::on_inventory_open(&player, *inv);
     return inv;
 }
 
@@ -447,6 +448,8 @@ void Hud::openInventory(
     blockPos = block;
     currentblockid = chunks.require(block.x, block.y, block.z).id;
     add(HudElement(hud_element_mode::inventory_bound, doc, blockUI, false));
+
+    scripting::on_inventory_open(&player, *blockinv);
 }
 
 void Hud::showExchangeSlot() {
@@ -461,7 +464,6 @@ void Hud::showExchangeSlot() {
     exchangeSlot->setInteractive(false);
     exchangeSlot->setZIndex(1);
     gui.store(SlotView::EXCHANGE_SLOT_NAME, exchangeSlot);
-
 }
 
 void Hud::showOverlay(
@@ -517,13 +519,19 @@ void Hud::dropExchangeSlot() {
 }
 
 void Hud::closeInventory() {
+    if (blockUI) {
+        scripting::on_inventory_closed(&player, *blockUI->getInventory());
+        blockUI = nullptr;
+    }
+    if (secondInvView) {
+        scripting::on_inventory_closed(&player, *secondInvView->getInventory());
+    }
     dropExchangeSlot();
     gui.remove(SlotView::EXCHANGE_SLOT_NAME);
     exchangeSlot = nullptr;
     exchangeSlotInv = nullptr;
     inventoryOpen = false;
     inventoryView = nullptr;
-    blockUI = nullptr;
     secondUI = nullptr;
 
     for (auto& element : elements) {
diff --git a/src/graphics/render/ChunksRenderer.cpp b/src/graphics/render/ChunksRenderer.cpp
index da40d822..6e6b4bd3 100644
--- a/src/graphics/render/ChunksRenderer.cpp
+++ b/src/graphics/render/ChunksRenderer.cpp
@@ -135,7 +135,7 @@ const Mesh* ChunksRenderer::getOrRender(
     if (found == meshes.end()) {
         return render(chunk, important);
     }
-    if (chunk->flags.modified) {
+    if (chunk->flags.modified && chunk->flags.lighted) {
         render(chunk, important);
     }
     return found->second.mesh.get();
@@ -149,9 +149,17 @@ const Mesh* ChunksRenderer::retrieveChunk(
     size_t index, const Camera& camera, Shader& shader, bool culling
 ) {
     auto chunk = chunks.getChunks()[index];
-    if (chunk == nullptr || !chunk->flags.lighted) {
+    if (chunk == nullptr) {
         return nullptr;
     }
+    if (!chunk->flags.lighted) {
+        const auto& found = meshes.find({chunk->x, chunk->z});
+        if (found == meshes.end()) {
+            return nullptr;
+        } else {
+            return found->second.mesh.get();
+        }
+    }
     float distance = glm::distance(
         camera.position,
         glm::vec3(
diff --git a/src/graphics/render/WorldRenderer.cpp b/src/graphics/render/WorldRenderer.cpp
index f83363cd..cefb61d5 100644
--- a/src/graphics/render/WorldRenderer.cpp
+++ b/src/graphics/render/WorldRenderer.cpp
@@ -89,7 +89,7 @@ WorldRenderer::WorldRenderer(
       ) {
     auto& settings = engine.getSettings();
     level.events->listen(
-        EVT_CHUNK_HIDDEN,
+        LevelEventType::CHUNK_HIDDEN,
         [this](LevelEventType, Chunk* chunk) { chunks->unload(chunk); }
     );
     auto assets = engine.getAssets();
diff --git a/src/logic/LevelController.cpp b/src/logic/LevelController.cpp
index 15ed2eb8..47a6384d 100644
--- a/src/logic/LevelController.cpp
+++ b/src/logic/LevelController.cpp
@@ -14,6 +14,7 @@
 #include "scripting/scripting.hpp"
 #include "lighting/Lighting.hpp"
 #include "settings.hpp"
+#include "world/LevelEvents.hpp"
 #include "world/Level.hpp"
 #include "world/World.hpp"
 
@@ -26,6 +27,14 @@ LevelController::LevelController(
       level(std::move(levelPtr)),
       chunks(std::make_unique<ChunksController>(*level)),
       playerTickClock(20, 3) {
+    
+    level->events->listen(LevelEventType::CHUNK_PRESENT, [](auto, Chunk* chunk) {
+        scripting::on_chunk_present(*chunk, chunk->flags.loaded);
+    });
+    level->events->listen(LevelEventType::CHUNK_UNLOAD, [](auto, Chunk* chunk) {
+        scripting::on_chunk_remove(*chunk);
+    });
+
     if (clientPlayer) {
         chunks->lighting = std::make_unique<Lighting>(
             level->content, *clientPlayer->chunks
@@ -99,6 +108,10 @@ void LevelController::update(float delta, bool pause) {
 
 void LevelController::saveWorld() {
     auto world = level->getWorld();
+    if (world->isNameless()) {
+        logger.info() << "nameless world will not be saved";
+        return;
+    }
     logger.info() << "writing world '" << world->getName() << "'";
     world->wfile->createDirectories();
     scripting::on_world_save();
diff --git a/src/logic/scripting/lua/libs/libcore.cpp b/src/logic/scripting/lua/libs/libcore.cpp
index 80a924c5..3daebca5 100644
--- a/src/logic/scripting/lua/libs/libcore.cpp
+++ b/src/logic/scripting/lua/libs/libcore.cpp
@@ -43,6 +43,10 @@ static int l_reset_content(lua::State* L) {
     return 0;
 }
 
+static int l_is_content_loaded(lua::State* L) {
+    return lua::pushboolean(L, content != nullptr);
+}
+
 /// @brief Creating new world
 /// @param name Name world
 /// @param seed Seed world
@@ -51,6 +55,9 @@ static int l_new_world(lua::State* L) {
     auto name = lua::require_string(L, 1);
     auto seed = lua::require_string(L, 2);
     auto generator = lua::require_string(L, 3);
+    if (level != nullptr) {
+        throw std::runtime_error("world must be closed before");
+    }
     auto controller = engine->getController();
     controller->createWorld(name, seed, generator);
     return 0;
@@ -60,7 +67,9 @@ static int l_new_world(lua::State* L) {
 /// @param name Name world
 static int l_open_world(lua::State* L) {
     auto name = lua::require_string(L, 1);
-
+    if (level != nullptr) {
+        throw std::runtime_error("world must be closed before");
+    }
     auto controller = engine->getController();
     controller->openWorld(name, false);
     return 0;
@@ -258,6 +267,7 @@ const luaL_Reg corelib[] = {
     {"get_version", lua::wrap<l_get_version>},
     {"load_content", lua::wrap<l_load_content>},
     {"reset_content", lua::wrap<l_reset_content>},
+    {"is_content_loaded", lua::wrap<l_is_content_loaded>},
     {"new_world", lua::wrap<l_new_world>},
     {"open_world", lua::wrap<l_open_world>},
     {"reopen_world", lua::wrap<l_reopen_world>},
diff --git a/src/logic/scripting/lua/libs/libworld.cpp b/src/logic/scripting/lua/libs/libworld.cpp
index 1acc1ad7..5d936842 100644
--- a/src/logic/scripting/lua/libs/libworld.cpp
+++ b/src/logic/scripting/lua/libs/libworld.cpp
@@ -4,8 +4,6 @@
 
 #include "api_lua.hpp"
 #include "assets/AssetsLoader.hpp"
-#include "coders/compression.hpp"
-#include "coders/gzip.hpp"
 #include "coders/json.hpp"
 #include "engine/Engine.hpp"
 #include "files/engine_paths.hpp"
@@ -14,6 +12,7 @@
 #include "voxels/Chunk.hpp"
 #include "voxels/Chunks.hpp"
 #include "voxels/GlobalChunks.hpp"
+#include "voxels/compressed_chunks.hpp"
 #include "world/Level.hpp"
 #include "world/World.hpp"
 #include "logic/LevelController.hpp"
@@ -123,122 +122,57 @@ static int l_get_generator(lua::State* L) {
 }
 
 static int l_get_chunk_data(lua::State* L) {
-    int x = (int)lua::tointeger(L, 1);
-    int y = (int)lua::tointeger(L, 2);
-    const auto& chunk = level->chunks->getChunk(x, y);
+    int x = static_cast<int>(lua::tointeger(L, 1));
+    int z = static_cast<int>(lua::tointeger(L, 2));
+    const auto& chunk = level->chunks->getChunk(x, z);
     if (chunk == nullptr) {
         lua::pushnil(L);
         return 0;
     }
+    auto chunkData = compressed_chunks::encode(*chunk);
+    return lua::newuserdata<lua::LuaBytearray>(L, std::move(chunkData));
+}
 
-    bool compress = false;
-    if (lua::gettop(L) >= 3) {
-        compress = lua::toboolean(L, 3);
+static void integrate_chunk_client(Chunk& chunk) {
+    int x = chunk.x;
+    int z = chunk.z;
+    auto chunksController = controller->getChunksController();
+    Lighting& lighting = *chunksController->lighting;
+    chunk.flags.loadedLights = false;
+    chunk.flags.lighted = false;
+
+    Lighting::prebuildSkyLight(chunk, *indices);
+    lighting.onChunkLoaded(x, z, true);
+
+    for (int lz = -1; lz <= 1; lz++) {
+        for (int lx = -1; lx <= 1; lx++) {
+            if (std::abs(lx) + std::abs(lz) != 1) {
+                continue;
+            }
+            if (auto other = level->chunks->getChunk(x + lx, z + lz)) {
+                other->flags.modified = true;
+                lighting.onChunkLoaded(x - 1, z, true);
+            }
+        }
     }
-    std::vector<ubyte> chunk_data;
-    if (compress) {
-        size_t rle_compressed_size;
-        size_t gzip_compressed_size;
-        const auto& data_ptr = chunk->encode();
-        ubyte* data = data_ptr.get();
-        const auto& rle_compressed_data_ptr = compression::compress(
-            data,
-            CHUNK_DATA_LEN,
-            rle_compressed_size,
-            compression::Method::EXTRLE16
-        );
-        const auto& gzip_compressed_data = compression::compress(
-            rle_compressed_data_ptr.get(),
-            rle_compressed_size,
-            gzip_compressed_size,
-            compression::Method::GZIP
-        );
-        auto tmp = dataio::h2le(rle_compressed_size);
-        chunk_data.reserve(gzip_compressed_size + sizeof(tmp));
-        chunk_data.insert(
-            chunk_data.begin() + 0, (char*)&tmp, ((char*)&tmp) + sizeof(tmp)
-        );
-        chunk_data.insert(
-            chunk_data.begin() + sizeof(tmp),
-            gzip_compressed_data.get(),
-            gzip_compressed_data.get() + gzip_compressed_size
-        );
-    } else {
-        const auto& data = chunk->encode();
-        chunk_data.reserve(CHUNK_DATA_LEN);
-        chunk_data.insert(
-            chunk_data.begin(), data.get(), data.get() + CHUNK_DATA_LEN
-        );
-    }
-    return lua::newuserdata<lua::LuaBytearray>(L, chunk_data);
 }
 
 static int l_set_chunk_data(lua::State* L) {
-    int x = (int)lua::tointeger(L, 1);
-    int y = (int)lua::tointeger(L, 2);
+    int x = static_cast<int>(lua::tointeger(L, 1));
+    int z = static_cast<int>(lua::tointeger(L, 2));
     auto buffer = lua::touserdata<lua::LuaBytearray>(L, 3);
-    bool is_compressed = false;
-    if (lua::gettop(L) >= 4) {
-        is_compressed = lua::toboolean(L, 4);
-    }
-    auto chunk = level->chunks->getChunk(x, y);
+    auto chunk = level->chunks->getChunk(x, z);
     if (chunk == nullptr) {
         return 0;
     }
-    if (is_compressed) {
-        std::vector<ubyte>& raw_data = buffer->data();
-        size_t gzip_decompressed_size =
-            dataio::le2h(*(size_t*)(raw_data.data()));
-        const auto& rle_data = compression::decompress(
-            raw_data.data() + sizeof(gzip_decompressed_size),
-            buffer->data().size() - sizeof(gzip_decompressed_size),
-            gzip_decompressed_size,
-            compression::Method::GZIP
-        );
-        const auto& data = compression::decompress(
-            rle_data.get(),
-            gzip_decompressed_size,
-            CHUNK_DATA_LEN,
-            compression::Method::EXTRLE16
-        );
-        chunk->decode(data.get());
-    } else {
-        chunk->decode(buffer->data().data());
+    compressed_chunks::decode(
+        *chunk, buffer->data().data(), buffer->data().size()
+    );
+    if (controller->getChunksController()->lighting == nullptr) {
+        return lua::pushboolean(L, true);
     }
-
-    auto chunksController = controller->getChunksController();
-    if (chunksController == nullptr) {
-        return 1;
-    }
-
-    Lighting& lighting = *chunksController->lighting;
-    chunk->updateHeights();
-    lighting.buildSkyLight(x, y);
-    chunk->flags.modified = true;
-    lighting.onChunkLoaded(x, y, true);
-
-    chunk = level->chunks->getChunk(x - 1, y);
-    if (chunk != nullptr) {
-        chunk->flags.modified = true;
-        lighting.onChunkLoaded(x - 1, y, true);
-    }
-    chunk = level->chunks->getChunk(x + 1, y);
-    if (chunk != nullptr) {
-        chunk->flags.modified = true;
-        lighting.onChunkLoaded(x + 1, y, true);
-    }
-    chunk = level->chunks->getChunk(x, y - 1);
-    if (chunk != nullptr) {
-        chunk->flags.modified = true;
-        lighting.onChunkLoaded(x, y - 1, true);
-    }
-    chunk = level->chunks->getChunk(x, y + 1);
-    if (chunk != nullptr) {
-        chunk->flags.modified = true;
-        lighting.onChunkLoaded(x, y + 1, true);
-    }
-
-    return 1;
+    integrate_chunk_client(*chunk);
+    return lua::pushboolean(L, true);
 }
 
 static int l_count_chunks(lua::State* L) {
diff --git a/src/logic/scripting/lua/lua_util.cpp b/src/logic/scripting/lua/lua_util.cpp
index 8c3adaea..842c7859 100644
--- a/src/logic/scripting/lua/lua_util.cpp
+++ b/src/logic/scripting/lua/lua_util.cpp
@@ -268,9 +268,9 @@ KeyCallback lua::create_simple_handler(State* L) {
 scripting::common_func lua::create_lambda(State* L) {
     auto funcptr = create_lambda_handler(L);
     return [=](const std::vector<dv::value>& args) -> dv::value {
-        int top = gettop(L) + 1;
         if (!get_from(L, LAMBDAS_TABLE, *funcptr, false))
             return nullptr;
+        int top = gettop(L) + 1;
         for (const auto& arg : args) {
             pushvalue(L, arg);
         }
@@ -290,9 +290,9 @@ scripting::common_func lua::create_lambda(State* L) {
 scripting::common_func lua::create_lambda_nothrow(State* L) {
     auto funcptr = create_lambda_handler(L);
     return [=](const std::vector<dv::value>& args) -> dv::value {
-        int top = gettop(L) - 1;
         if (!get_from(L, LAMBDAS_TABLE, *funcptr, false))
             return nullptr;
+        int top = gettop(L) - 1;
         for (const auto& arg : args) {
             pushvalue(L, arg);
         }
diff --git a/src/logic/scripting/lua/lua_wrapper.hpp b/src/logic/scripting/lua/lua_wrapper.hpp
index ee184cb1..8637babc 100644
--- a/src/logic/scripting/lua/lua_wrapper.hpp
+++ b/src/logic/scripting/lua/lua_wrapper.hpp
@@ -21,6 +21,11 @@ namespace lua {
     }
 
     inline void pop(lua::State* L, int n = 1) {
+#ifndef NDEBUG
+        if (lua_gettop(L) < n) {
+            abort();
+        }
+#endif
         lua_pop(L, n);
     }
     inline void insert(lua::State* L, int idx) {
diff --git a/src/logic/scripting/scripting.cpp b/src/logic/scripting/scripting.cpp
index b8f00d3f..d58879d3 100644
--- a/src/logic/scripting/scripting.cpp
+++ b/src/logic/scripting/scripting.cpp
@@ -24,6 +24,7 @@
 #include "util/stringutil.hpp"
 #include "util/timeutil.hpp"
 #include "voxels/Block.hpp"
+#include "voxels/Chunk.hpp"
 #include "world/Level.hpp"
 #include "interfaces/Process.hpp"
 
@@ -411,6 +412,65 @@ bool scripting::on_block_interact(
     );
 }
 
+void scripting::on_chunk_present(const Chunk& chunk, bool loaded) {
+    auto args = [&chunk, loaded](lua::State* L) {
+        lua::pushvec_stack<2>(L, {chunk.x, chunk.z});
+        lua::pushboolean(L, loaded);
+        return 3;
+    };
+    for (auto& [packid, pack] : content->getPacks()) {
+        if (pack->worldfuncsset.onchunkpresent) {
+            lua::emit_event(
+                lua::get_main_state(), packid + ":.chunkpresent", args
+            );
+        }
+    }
+}
+
+void scripting::on_chunk_remove(const Chunk& chunk) {
+    auto args = [&chunk](lua::State* L) {
+        lua::pushvec_stack<2>(L, {chunk.x, chunk.z});
+        return 2;
+    };
+    for (auto& [packid, pack] : content->getPacks()) {
+        if (pack->worldfuncsset.onchunkremove) {
+            lua::emit_event(
+                lua::get_main_state(), packid + ":.chunkremove", args
+            );
+        }
+    }
+}
+
+void scripting::on_inventory_open(const Player* player, const Inventory& inventory) {
+    auto args = [player, &inventory](lua::State* L) {
+        lua::pushinteger(L, inventory.getId());
+        lua::pushinteger(L, player ? player->getId() : -1);
+        return 2;
+    };
+    for (auto& [packid, pack] : content->getPacks()) {
+        if (pack->worldfuncsset.oninventoryopen) {
+            lua::emit_event(
+                lua::get_main_state(), packid + ":.inventoryopen", args
+            );
+        }
+    }
+}
+
+void scripting::on_inventory_closed(const Player* player, const Inventory& inventory) {
+    auto args = [player, &inventory](lua::State* L) {
+        lua::pushinteger(L, inventory.getId());
+        lua::pushinteger(L, player ? player->getId() : -1);
+        return 2;
+    };
+    for (auto& [packid, pack] : content->getPacks()) {
+        if (pack->worldfuncsset.oninventoryclosed) {
+            lua::emit_event(
+                lua::get_main_state(), packid + ":.inventoryclosed", args
+            );
+        }
+    }
+}
+
 void scripting::on_player_tick(Player* player, int tps) {
     auto args = [=](lua::State* L) {
         lua::pushinteger(L, player ? player->getId() : -1);
@@ -837,6 +897,14 @@ void scripting::load_world_script(
         register_event(env, "on_block_interact", prefix + ":.blockinteract");
     funcsset.onplayertick =
         register_event(env, "on_player_tick", prefix + ":.playertick");
+    funcsset.onchunkpresent =
+        register_event(env, "on_chunk_present", prefix + ":.chunkpresent");
+    funcsset.onchunkremove =
+        register_event(env, "on_chunk_remove", prefix + ":.chunkremove");
+    funcsset.oninventoryopen =
+        register_event(env, "on_inventory_open", prefix + ":.inventoryopen");
+    funcsset.oninventoryclosed =
+        register_event(env, "on_inventory_closed", prefix + ":.inventoryclosed");
 }
 
 void scripting::load_layout_script(
diff --git a/src/logic/scripting/scripting.hpp b/src/logic/scripting/scripting.hpp
index fb552f66..b447de28 100644
--- a/src/logic/scripting/scripting.hpp
+++ b/src/logic/scripting/scripting.hpp
@@ -17,6 +17,7 @@ struct ContentPack;
 class ContentIndices;
 class Level;
 class Block;
+class Chunk;
 class Player;
 struct ItemDef;
 class Inventory;
@@ -84,6 +85,13 @@ namespace scripting {
         Player* player, const Block& block, const glm::ivec3& pos
     );
     bool on_block_interact(Player* player, const Block& block, const glm::ivec3& pos);
+    
+    void on_chunk_present(const Chunk& chunk, bool loaded);
+    void on_chunk_remove(const Chunk& chunk);
+
+    void on_inventory_open(const Player* player, const Inventory& inventory);
+    void on_inventory_closed(const Player* player, const Inventory& inventory);
+
     void on_player_tick(Player* player, int tps);
 
     /// @brief Called on RMB click with the item selected
diff --git a/src/util/HandlersList.hpp b/src/util/HandlersList.hpp
index 5af5250d..737fdf36 100644
--- a/src/util/HandlersList.hpp
+++ b/src/util/HandlersList.hpp
@@ -1,7 +1,9 @@
 #pragma once
 
 #include <mutex>
-#include <iostream>
+#include <vector>
+#include <algorithm>
+#include <unordered_map>
 
 #include "typedefs.hpp"
 #include "delegates.hpp"
diff --git a/src/voxels/Chunk.cpp b/src/voxels/Chunk.cpp
index a32fc8ba..2c1f4fd8 100644
--- a/src/voxels/Chunk.cpp
+++ b/src/voxels/Chunk.cpp
@@ -13,19 +13,6 @@ Chunk::Chunk(int xpos, int zpos) : x(xpos), z(zpos) {
     top = CHUNK_H;
 }
 
-bool Chunk::isEmpty() const {
-    int id = -1;
-    for (uint i = 0; i < CHUNK_VOL; i++) {
-        if (voxels[i].id != id) {
-            if (id != -1)
-                return false;
-            else
-                id = voxels[i].id;
-        }
-    }
-    return true;
-}
-
 void Chunk::updateHeights() {
     for (uint i = 0; i < CHUNK_VOL; i++) {
         if (voxels[i].id != 0) {
diff --git a/src/voxels/Chunk.hpp b/src/voxels/Chunk.hpp
index 55cdac21..3ce6e641 100644
--- a/src/voxels/Chunk.hpp
+++ b/src/voxels/Chunk.hpp
@@ -11,6 +11,7 @@
 #include "maths/aabb.hpp"
 #include "voxel.hpp"
 
+/// @brief Total bytes number of chunk voxel data
 inline constexpr int CHUNK_DATA_LEN = CHUNK_VOL * 4;
 
 class ContentReport;
@@ -45,8 +46,7 @@ public:
 
     Chunk(int x, int z);
 
-    bool isEmpty() const;
-
+    /// @brief Refresh `bottom` and `top` values
     void updateHeights();
 
     // unused
diff --git a/src/voxels/Chunks.cpp b/src/voxels/Chunks.cpp
index f65c1863..bf9b2990 100644
--- a/src/voxels/Chunks.cpp
+++ b/src/voxels/Chunks.cpp
@@ -34,7 +34,7 @@ Chunks::Chunks(
       areaMap(w, d) {
     areaMap.setCenter(ox-w/2, oz-d/2);
     areaMap.setOutCallback([this](int, int, const auto& chunk) {
-        this->events->trigger(EVT_CHUNK_HIDDEN, chunk.get());
+        this->events->trigger(LevelEventType::CHUNK_HIDDEN, chunk.get());
     });
 }
 
@@ -323,7 +323,7 @@ void Chunks::resize(uint32_t newW, uint32_t newD) {
 bool Chunks::putChunk(const std::shared_ptr<Chunk>& chunk) {
     if (areaMap.set(chunk->x, chunk->z, chunk)) {
         if (events) {
-            events->trigger(LevelEventType::EVT_CHUNK_SHOWN, chunk.get());
+            events->trigger(LevelEventType::CHUNK_SHOWN, chunk.get());
         }
         return true;
     }
diff --git a/src/voxels/GlobalChunks.cpp b/src/voxels/GlobalChunks.cpp
index 8f8e05bb..1e67a374 100644
--- a/src/voxels/GlobalChunks.cpp
+++ b/src/voxels/GlobalChunks.cpp
@@ -12,6 +12,7 @@
 #include "objects/Entities.hpp"
 #include "voxels/blocks_agent.hpp"
 #include "typedefs.hpp"
+#include "world/LevelEvents.hpp"
 #include "world/Level.hpp"
 #include "world/World.hpp"
 #include "Block.hpp"
@@ -125,6 +126,8 @@ std::shared_ptr<Chunk> GlobalChunks::create(int x, int z) {
         chunk->flags.loadedLights = true;
     }
     chunk->blocksMetadata = regions.getBlocksData(chunk->x, chunk->z);
+
+    level.events->trigger(LevelEventType::CHUNK_PRESENT, chunk.get());
     return chunk;
 }
 
diff --git a/src/voxels/compressed_chunks.cpp b/src/voxels/compressed_chunks.cpp
new file mode 100644
index 00000000..0e6772af
--- /dev/null
+++ b/src/voxels/compressed_chunks.cpp
@@ -0,0 +1,61 @@
+#include "compressed_chunks.hpp"
+
+#include "coders/rle.hpp"
+#include "coders/gzip.hpp"
+#include "coders/byte_utils.hpp"
+#include "voxels/Chunk.hpp"
+
+inline constexpr int HAS_VOXELS = 0x1;
+inline constexpr int HAS_METADATA = 0x2;
+
+std::vector<ubyte> compressed_chunks::encode(const Chunk& chunk) {
+    auto data = chunk.encode();
+
+    /// world.get_chunk_data is only available in the main Lua state
+    static util::Buffer<ubyte> rleBuffer;
+    if (rleBuffer.size() < CHUNK_DATA_LEN * 2) {
+        rleBuffer = util::Buffer<ubyte>(CHUNK_DATA_LEN * 2);
+    }
+    size_t rleCompressedSize =
+        extrle::encode16(data.get(), CHUNK_DATA_LEN, rleBuffer.data());
+
+    const auto gzipCompressedData = gzip::compress(
+        rleBuffer.data(), rleCompressedSize
+    );
+    auto metadataBytes = chunk.blocksMetadata.serialize();
+
+    ByteBuilder builder(2 + 8 + gzipCompressedData.size() + metadataBytes.size());
+    builder.put(HAS_VOXELS | HAS_METADATA); // flags
+    builder.put(0); // reserved
+    builder.putInt32(gzipCompressedData.size());
+    builder.put(gzipCompressedData.data(), gzipCompressedData.size());
+    builder.putInt32(metadataBytes.size());
+    builder.put(metadataBytes.data(), metadataBytes.size());
+    return builder.build();
+}
+
+void compressed_chunks::decode(Chunk& chunk, const ubyte* src, size_t size) {
+    ByteReader reader(src, size);
+
+    ubyte flags = reader.get();
+    reader.skip(1); // reserved byte
+
+    if (flags & HAS_VOXELS) {
+        size_t gzipCompressedSize = reader.getInt32();
+        
+        auto rleData = gzip::decompress(reader.pointer(), gzipCompressedSize);
+        reader.skip(gzipCompressedSize);
+
+        /// world.get_chunk_data is only available in the main Lua state
+        static util::Buffer<ubyte> voxelData (CHUNK_DATA_LEN);
+        extrle::decode16(rleData.data(), rleData.size(), voxelData.data());
+        chunk.decode(voxelData.data());
+        chunk.updateHeights();
+    }
+    if (flags & HAS_METADATA) {
+        size_t metadataSize = reader.getInt32();
+        chunk.blocksMetadata.deserialize(reader.pointer(), metadataSize);
+        reader.skip(metadataSize);
+    }
+    chunk.setModifiedAndUnsaved();
+}
diff --git a/src/voxels/compressed_chunks.hpp b/src/voxels/compressed_chunks.hpp
new file mode 100644
index 00000000..dc0bc5b6
--- /dev/null
+++ b/src/voxels/compressed_chunks.hpp
@@ -0,0 +1,12 @@
+#pragma once
+
+#include "typedefs.hpp"
+
+#include <vector>
+
+class Chunk;
+
+namespace compressed_chunks {
+    std::vector<ubyte> encode(const Chunk& chunk);
+    void decode(Chunk& chunk, const ubyte* src, size_t size);
+}
diff --git a/src/world/Level.cpp b/src/world/Level.cpp
index 7ea871ee..460b34a4 100644
--- a/src/world/Level.cpp
+++ b/src/world/Level.cpp
@@ -52,13 +52,14 @@ Level::Level(
         entities->setNextID(worldInfo.nextEntityId);
     }
 
-    events->listen(LevelEventType::EVT_CHUNK_SHOWN, [this](LevelEventType, Chunk* chunk) {
+    events->listen(LevelEventType::CHUNK_SHOWN, [this](LevelEventType, Chunk* chunk) {
         chunks->incref(chunk);
     });
-    events->listen(LevelEventType::EVT_CHUNK_HIDDEN, [this](LevelEventType, Chunk* chunk) {
+    events->listen(LevelEventType::CHUNK_HIDDEN, [this](LevelEventType, Chunk* chunk) {
         chunks->decref(chunk);
     });
-    chunks->setOnUnload([this](const Chunk& chunk) {
+    chunks->setOnUnload([this](Chunk& chunk) {
+        events->trigger(LevelEventType::CHUNK_UNLOAD, &chunk);
         AABB aabb = chunk.getAABB();
         entities->despawn(entities->getAllInside(aabb));
     });
diff --git a/src/world/LevelEvents.hpp b/src/world/LevelEvents.hpp
index f7bbaa7f..8096428b 100644
--- a/src/world/LevelEvents.hpp
+++ b/src/world/LevelEvents.hpp
@@ -6,9 +6,11 @@
 
 class Chunk;
 
-enum LevelEventType {
-    EVT_CHUNK_SHOWN,
-    EVT_CHUNK_HIDDEN,
+enum class LevelEventType {
+    CHUNK_SHOWN,
+    CHUNK_HIDDEN,
+    CHUNK_PRESENT,
+    CHUNK_UNLOAD,
 };
 
 using ChunkEventFunc = std::function<void(LevelEventType, Chunk*)>;
diff --git a/src/world/World.cpp b/src/world/World.cpp
index a3b83742..54785862 100644
--- a/src/world/World.cpp
+++ b/src/world/World.cpp
@@ -94,7 +94,12 @@ std::unique_ptr<Level> World::create(
         content,
         packs
     );
-    logger.info() << "created world '" << name << "' (" << directory.u8string() << ")";
+    if (name.empty()) {
+        logger.info() << "created nameless world";
+    } else {
+        logger.info() << "created world '" << name << "' ("
+                      << directory.u8string() << ")";
+    }
     logger.info() << "world seed: " << seed << " generator: " << generator;
     return std::make_unique<Level>(std::move(world), content, settings);
 }
diff --git a/src/world/World.hpp b/src/world/World.hpp
index 552f70ec..da1ebd81 100644
--- a/src/world/World.hpp
+++ b/src/world/World.hpp
@@ -140,6 +140,10 @@ public:
     /// @brief Get world generator id
     std::string getGenerator() const;
 
+    bool isNameless() const {
+        return info.name.empty();
+    }
+
     WorldInfo& getInfo() {
         return info;
     }
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 0597d6e4..df2d1e17 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -8,23 +8,19 @@ find_package(GTest)
 
 add_executable(${PROJECT_NAME} ${SOURCES})
 
-target_include_directories(${PROJECT_NAME} PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/../src)
-target_link_libraries(
-  ${PROJECT_NAME}
-  VoxelEngineSrc
-  GTest::gtest_main
-)
+target_include_directories(${PROJECT_NAME}
+                           PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/../src)
+target_link_libraries(${PROJECT_NAME} VoxelEngineSrc GTest::gtest_main)
 
-# HACK: copy res to test/ folder for fixing problem compatibility MultiConfig and non
-# MultiConfig builds. Delete in future and use only root res folder
-# Also this resolve problem with ctests, because it set cwd to CMAKE_CURRENT_BINARY_DIR
+# HACK: copy res to test/ folder for fixing problem compatibility MultiConfig
+# and non MultiConfig builds. Delete in future and use only root res folder Also
+# this resolve problem with ctests, because it set cwd to
+# CMAKE_CURRENT_BINARY_DIR
 add_custom_command(
-  TARGET ${PROJECT_NAME} 
-  POST_BUILD 
-  COMMAND ${CMAKE_COMMAND} -E copy_directory_if_different 
-          ${CMAKE_SOURCE_DIR}/res 
-          ${CMAKE_CURRENT_BINARY_DIR}/res
-  )
+    TARGET ${PROJECT_NAME}
+    POST_BUILD
+    COMMAND ${CMAKE_COMMAND} -E copy_directory_if_different
+            ${CMAKE_SOURCE_DIR}/res ${CMAKE_CURRENT_BINARY_DIR}/res)
 
 include(GoogleTest)
 gtest_discover_tests(${PROJECT_NAME})
diff --git a/vctest/CMakeLists.txt b/vctest/CMakeLists.txt
index 6c1a3843..916eef31 100644
--- a/vctest/CMakeLists.txt
+++ b/vctest/CMakeLists.txt
@@ -8,24 +8,35 @@ add_executable(${PROJECT_NAME} ${SOURCES})
 
 if(MSVC)
     if(NOT CMAKE_BUILD_TYPE)
-      set(CMAKE_BUILD_TYPE Release CACHE STRING "Build type" FORCE)
+        set(CMAKE_BUILD_TYPE
+            Release
+            CACHE STRING "Build type" FORCE)
     endif()
-    if((CMAKE_BUILD_TYPE EQUAL "Release") OR (CMAKE_BUILD_TYPE EQUAL "RelWithDebInfo"))
-      set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Release>:Release>")
-      target_compile_options(${PROJECT_NAME} PRIVATE /W4 /MT /O2)
+    if((CMAKE_BUILD_TYPE EQUAL "Release") OR (CMAKE_BUILD_TYPE EQUAL
+                                              "RelWithDebInfo"))
+        set(CMAKE_MSVC_RUNTIME_LIBRARY
+            "MultiThreaded$<$<CONFIG:Release>:Release>")
+        target_compile_options(${PROJECT_NAME} PRIVATE /W4 /MT /O2)
     else()
-      target_compile_options(${PROJECT_NAME} PRIVATE /W4)
+        target_compile_options(${PROJECT_NAME} PRIVATE /W4)
     endif()
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
 else()
-  target_compile_options(${PROJECT_NAME} PRIVATE -Wall -Wextra
-    -Wformat-nonliteral -Wcast-align
-    -Wpointer-arith -Wundef
-    -Wwrite-strings -Wno-unused-parameter)
+    target_compile_options(
+        ${PROJECT_NAME}
+        PRIVATE -Wall
+                -Wextra
+                -Wformat-nonliteral
+                -Wcast-align
+                -Wpointer-arith
+                -Wundef
+                -Wwrite-strings
+                -Wno-unused-parameter)
 endif()
 
-if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
     set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -no-pie -lstdc++fs")
 endif()
 
-target_include_directories(${PROJECT_NAME} PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/../src ${CMAKE_DL_LIBS})
+target_include_directories(
+    ${PROJECT_NAME} PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/../src ${CMAKE_DL_LIBS})