diff --git a/src/frontend/ContentGfxCache.cpp b/src/frontend/ContentGfxCache.cpp
index 844fd4e6..574c22a5 100644
--- a/src/frontend/ContentGfxCache.cpp
+++ b/src/frontend/ContentGfxCache.cpp
@@ -69,10 +69,6 @@ void ContentGfxCache::refresh() {
 
 ContentGfxCache::~ContentGfxCache() = default;
 
-const Content* ContentGfxCache::getContent() const {
-    return &content;
-}
-
 const model::Model& ContentGfxCache::getModel(blockid_t id) const {
     const auto& found = models.find(id);
     if (found == models.end()) {
diff --git a/src/frontend/ContentGfxCache.hpp b/src/frontend/ContentGfxCache.hpp
index c1b17db3..b5816c82 100644
--- a/src/frontend/ContentGfxCache.hpp
+++ b/src/frontend/ContentGfxCache.hpp
@@ -38,8 +38,6 @@ public:
 
     const model::Model& getModel(blockid_t id) const;
 
-    const Content* getContent() const;
-
     void refresh(const Block& block, const Atlas& atlas);
 
     void refresh();
diff --git a/src/frontend/LevelFrontend.cpp b/src/frontend/LevelFrontend.cpp
index b796625c..5dfdf822 100644
--- a/src/frontend/LevelFrontend.cpp
+++ b/src/frontend/LevelFrontend.cpp
@@ -101,14 +101,6 @@ Level& LevelFrontend::getLevel() {
     return level;
 }
 
-const Level& LevelFrontend::getLevel() const {
-    return level;
-}
-
-const Assets& LevelFrontend::getAssets() const {
-    return assets;
-}
-
 ContentGfxCache& LevelFrontend::getContentGfxCache() {
     return *contentCache;
 }
diff --git a/src/frontend/LevelFrontend.hpp b/src/frontend/LevelFrontend.hpp
index da1f198a..cc4f996b 100644
--- a/src/frontend/LevelFrontend.hpp
+++ b/src/frontend/LevelFrontend.hpp
@@ -25,8 +25,6 @@ public:
     ~LevelFrontend();
 
     Level& getLevel();
-    const Level& getLevel() const;
-    const Assets& getAssets() const;
     const ContentGfxCache& getContentGfxCache() const;
     ContentGfxCache& getContentGfxCache();
     LevelController* getController() const;
diff --git a/src/frontend/menu.cpp b/src/frontend/menu.cpp
index 9877cf60..62cf6959 100644
--- a/src/frontend/menu.cpp
+++ b/src/frontend/menu.cpp
@@ -32,13 +32,12 @@ void menus::create_version_label(gui::GUI& gui) {
     ));
 }
 
-bool menus::call(Engine& engine, runnable func) {
+void menus::call(Engine& engine, runnable func) {
     if (engine.isHeadless()) {
         throw std::runtime_error("menus::call(...) in headless mode");
     }
     try {
         func();
-        return true;
     } catch (const contentpack_error& error) {
         engine.setScreen(std::make_shared<MenuScreen>(engine));
         // could not to find or read pack
@@ -47,7 +46,7 @@ bool menus::call(Engine& engine, runnable func) {
             langs::get(L"error.pack-not-found") + L": " +
                 util::str2wstr_utf8(error.getPackId())
         );
-        return false;
+        throw std::runtime_error(error);
     } catch (const assetload::error& error) {
         engine.setScreen(std::make_shared<MenuScreen>(engine));
         guiutil::alert(
@@ -55,11 +54,11 @@ bool menus::call(Engine& engine, runnable func) {
             langs::get(L"Assets Load Error", L"menu") + L":\n" +
             util::str2wstr_utf8(error.what())
         );
-        return false;
+        throw std::runtime_error(error);
     } catch (const parsing_error& error) {
         engine.setScreen(std::make_shared<MenuScreen>(engine));
         guiutil::alert(engine, util::str2wstr_utf8(error.errorLog()));
-        return false;
+        throw std::runtime_error(error);
     } catch (const std::runtime_error& error) {
         engine.setScreen(std::make_shared<MenuScreen>(engine));
         guiutil::alert(
@@ -67,7 +66,7 @@ bool menus::call(Engine& engine, runnable func) {
             langs::get(L"Content Error", L"menu") + L":\n" +
             util::str2wstr_utf8(error.what())
         );
-        return false;
+        throw std::runtime_error(error);
     }
 }
 
diff --git a/src/frontend/menu.hpp b/src/frontend/menu.hpp
index b7fb4495..ea44c900 100644
--- a/src/frontend/menu.hpp
+++ b/src/frontend/menu.hpp
@@ -32,5 +32,5 @@ namespace menus {
         const std::wstring& text = L""
     );
 
-    bool call(Engine& engine, runnable func);
+    void call(Engine& engine, runnable func);
 }
diff --git a/src/logic/EngineController.cpp b/src/logic/EngineController.cpp
index 48bad7cf..4d9f8953 100644
--- a/src/logic/EngineController.cpp
+++ b/src/logic/EngineController.cpp
@@ -1,7 +1,6 @@
 #include "EngineController.hpp"
 
 #include <algorithm>
-#include <filesystem>
 #include <memory>
 
 #include "engine/Engine.hpp"
@@ -26,12 +25,9 @@
 #include "world/World.hpp"
 #include "LevelController.hpp"
 
-namespace fs = std::filesystem;
-
 static debug::Logger logger("engine-control");
 
-EngineController::EngineController(Engine& engine) : engine(engine) {
-}
+EngineController::EngineController(Engine& engine) : engine(engine) {}
 
 void EngineController::deleteWorld(const std::string& name) {
     io::path folder = engine.getPaths().getWorldFolderByName(name);
@@ -83,65 +79,66 @@ std::shared_ptr<Task> create_converter(
     );
 }
 
-static void show_convert_request(
-    Engine& engine,
-    const Content* content,
-    const std::shared_ptr<ContentReport>& report,
-    const std::shared_ptr<WorldFiles>& worldFiles,
-    const runnable& postRunnable
-) {
-    auto on_confirm = [&engine, worldFiles, content, report, postRunnable]() {
-            auto converter =
-                create_converter(engine, worldFiles, content, report, postRunnable);
-            menus::show_process_panel(
-                engine, converter, L"Converting world..."
-            );
-        };
+struct ConfirmRequest {
+    bool memo;
+    std::wstring message;
+    std::wstring text;
+};
 
-    std::wstring message = L"world.convert-block-layouts";
+static ConfirmRequest create_convert_request(
+    const std::shared_ptr<ContentReport>& report
+) {
+    ConfirmRequest request {false, L"", L""};
+
+    request.message = L"world.convert-block-layouts";
     if (report->hasContentReorder()) {
-        message = L"world.convert-request";
+        request.message = L"world.convert-request";
     }
     if (report->isUpgradeRequired()) {
-        message = L"world.upgrade-request";
+        request.message = L"world.upgrade-request";
     } else if (report->hasDataLoss()) {
-        message = L"world.convert-with-loss";
-        std::wstring text;
+        request.message = L"world.convert-with-loss";
+        request.memo = true;
         for (const auto& line : report->getDataLoss()) {
-            text += util::str2wstr_utf8(line) + L"\n";
+            request.text += util::str2wstr_utf8(line) + L"\n";
         }
-        guiutil::confirm_with_memo(
-            engine,
-            langs::get(message),
-            text,
-            on_confirm,
-            L"",
-            langs::get(L"Cancel")
-        );
-        return;
     }
-    guiutil::confirm(
-        engine,
-        langs::get(message),
-        on_confirm,
-        nullptr,
-        L"",
-        langs::get(L"Cancel")
-    );
+    return request;
 }
 
-static bool load_world_content(Engine& engine, const io::path& folder) {
+static void call(Engine& engine, runnable func) {
+    if (engine.isHeadless()) {
+        func();
+    } else {
+        menus::call(engine, std::move(func));
+    }
+}
+
+static void start(Engine& engine, std::shared_ptr<Task> task, const std::wstring& message) {
+    if (engine.isHeadless()) {
+        task->waitForEnd();
+    } else {
+        menus::show_process_panel(engine, task, message);
+    }
+}
+
+static void check_world(const EnginePaths& paths, const io::path& folder) {
+    auto worldFile = folder / "world.json";
+    if (!io::exists(worldFile)) {
+        throw std::runtime_error(worldFile.string() + " does not exists");
+    }
+}
+
+static const Content* load_world_content(Engine& engine, const io::path& folder) {
     auto& paths = engine.getPaths();
     auto& contentControl = engine.getContentControl();
     paths.setCurrentWorldFolder(folder);
-    if (engine.isHeadless()) {
+
+    check_world(paths, folder);
+    call(engine, [&contentControl]() {
         contentControl.loadContent(ContentPack::worldPacksList("world:"));
-        return true;
-    } else {
-        return menus::call(engine, [&contentControl]() {
-            contentControl.loadContent(ContentPack::worldPacksList("world:"));
-        });
-    }
+    });
+    return contentControl.get();
 }
 
 static void load_world(
@@ -149,21 +146,15 @@ static void load_world(
     const std::shared_ptr<WorldFiles>& worldFiles,
     int64_t localPlayer
 ) {
-    try {
+    call(engine, [&engine, worldFiles, localPlayer] () {
         auto& contentControl = engine.getContentControl();
         auto content = contentControl.get();
-        auto& packs = contentControl.getContentPacks();
+        const auto& packs = contentControl.getContentPacks();
         auto& settings = engine.getSettings();
 
         auto level = World::load(worldFiles, settings, *content, packs);
         engine.onWorldOpen(std::move(level), localPlayer);
-    } catch (const world_load_error& error) {
-        guiutil::alert(
-            engine,
-            langs::get(L"Error") + L": " + util::str2wstr_utf8(error.what())
-        );
-        return;
-    }
+    });
 }
 
 static dv::value create_missing_content_report(
@@ -180,7 +171,9 @@ static dv::value create_missing_content_report(
     return root;
 }
 
-void EngineController::onMissingContent(const std::shared_ptr<ContentReport>& report) {
+void EngineController::onMissingContent(
+    const std::shared_ptr<ContentReport>& report
+) {
     if (engine.isHeadless()) {
         throw std::runtime_error(
             "missing content: " +
@@ -196,50 +189,63 @@ void EngineController::onMissingContent(const std::shared_ptr<ContentReport>& re
     }
 }
 
+static void confirm(
+    Engine& engine, ConfirmRequest request, bool confirmed, runnable callback
+) {
+    if (confirmed || engine.isHeadless()) {
+        callback();
+        return;
+    }
+    if (request.memo) {
+        guiutil::confirm_with_memo(
+            engine,
+            langs::get(request.message),
+            request.text,
+            callback,
+            L"",
+            langs::get(L"Cancel")
+        );
+    } else {
+        guiutil::confirm(
+            engine,
+            langs::get(request.message),
+            callback,
+            nullptr,
+            L"",
+            langs::get(L"Cancel")
+        );
+    }
+}
+
 void EngineController::openWorld(const std::string& name, bool confirmConvert) {
     const auto& paths = engine.getPaths();
+    auto& debugSettings = engine.getSettings().debug;
     auto folder = paths.getWorldsFolder() / name;
-    auto worldFile = folder / "world.json";
-    if (!io::exists(worldFile)) {
-        throw std::runtime_error(worldFile.string() + " does not exists");
-    }
 
-    if (!load_world_content(engine, folder)) {
+    auto content = load_world_content(engine, folder);
+    auto worldFiles = std::make_shared<WorldFiles>(folder, debugSettings);
+    auto report = World::checkIndices(worldFiles, content);
+    
+    if (report == nullptr) {
+        load_world(engine, std::move(worldFiles), localPlayer);
+        return;
+    }
+    if (report->hasMissingContent()) {
+        onMissingContent(report);
         return;
     }
 
-    const auto& contentControl = engine.getContentControl();
-    const Content* content = contentControl.get();
-    auto worldFiles = std::make_shared<WorldFiles>(
-        folder, engine.getSettings().debug);
-    if (auto report = World::checkIndices(worldFiles, content)) {
-        if (report->hasMissingContent()) {
-            onMissingContent(report);
-        } else {
-            if (confirmConvert) {
-                auto task = create_converter(
-                    engine,
-                    worldFiles,
-                    content,
-                    report,
-                    [=]() { openWorld(name, false); }
-                );
-                if (engine.isHeadless()) {
-                    task->waitForEnd();
-                } else {
-                    menus::show_process_panel(
-                        engine, task, L"Converting world..."
-                    );
-                }
-            } else {
-                show_convert_request(engine, content, report, std::move(worldFiles), [=]() {
-                    openWorld(name, false);
-                });
-            }
-        }
-        return;
-    }
-    load_world(engine, std::move(worldFiles), localPlayer);
+    auto request = create_convert_request(report);
+    confirm(engine, std::move(request), confirmConvert, [=]() {
+        auto task = create_converter(
+            engine,
+            worldFiles,
+            content,
+            report,
+            [=]() { openWorld(name, false); }
+        );
+        start(engine, std::move(task), L"Converting world...");
+    });
 }
 
 inline uint64_t str2seed(const std::string& seedstr) {
@@ -266,15 +272,11 @@ void EngineController::createWorld(
     EnginePaths& paths = engine.getPaths();
     auto folder = paths.getWorldsFolder() / name;
 
-    if (engine.isHeadless()) {
+    call(engine, [this, &paths, folder]() {
         engine.getContentControl().loadContent();
         paths.setCurrentWorldFolder(folder);
-    } else if (!menus::call(engine, [this, &paths, folder]() {
-            engine.getContentControl().loadContent();
-            paths.setCurrentWorldFolder(folder);
-        })) {
-        return;
-    }
+    });
+
     auto& contentControl = engine.getContentControl();
     auto level = World::create(
         name,
@@ -301,6 +303,48 @@ void EngineController::reopenWorld(World* world) {
     openWorld(name, true);
 }
 
+static void reconfig_packs_outside(
+    ContentControl& contentControl,
+    const std::vector<std::string>& packsToAdd,
+    const std::vector<std::string>& packsToRemove
+) {
+    auto& manager = contentControl.scan();
+
+    auto names = PacksManager::getNames(
+        contentControl.getContentPacks()
+    );
+    for (const auto& id : packsToAdd) {
+        names.push_back(id);
+    }
+    for (const auto& id : packsToRemove) {
+        manager.exclude(id);
+        names.erase(std::find(names.begin(), names.end(), id));
+    }
+    names = manager.assemble(names);
+    contentControl.getContentPacks() = manager.getAll(names);
+}
+
+static void reconfig_packs_inside(
+    PacksManager& manager,
+    std::vector<std::string>& names,
+    const std::vector<std::string>& packsToAdd,
+    const std::vector<std::string>& packsToRemove
+) {
+    for (const auto& id : packsToAdd) {
+        names.push_back(id);
+    }
+    for (const auto& id : packsToRemove) {
+        manager.exclude(id);
+        const auto& found = std::find(names.begin(), names.end(), id);
+        if (found != names.end()) {
+            names.erase(found);
+        } else {
+            logger.warning()
+                << "attempt to remove non-installed pack: " << id;
+        }
+    }
+}
+
 void EngineController::reconfigPacks(
     LevelController* controller,
     const std::vector<std::string>& packsToAdd,
@@ -308,8 +352,32 @@ void EngineController::reconfigPacks(
 ) {
     auto& contentControl = engine.getContentControl();
     auto content = contentControl.get();
-    bool hasIndices = false;
 
+    runnable removeFunc = [this, controller, packsToAdd, packsToRemove, &contentControl]() {
+        if (controller == nullptr) {
+            try {
+                reconfig_packs_outside(contentControl, packsToAdd, packsToRemove);
+            } catch (const contentpack_error& err) {
+                throw std::runtime_error(
+                    std::string(err.what()) + " [" + err.getPackId() + "]"
+                );
+            }
+        } else {
+            auto world = controller->getLevel()->getWorld();
+            controller->saveWorld();
+
+            auto names = PacksManager::getNames(world->getPacks());
+            auto& manager = contentControl.scan();
+            reconfig_packs_inside(manager, names, packsToAdd, packsToRemove);
+
+            auto& wfile = *world->wfile;
+            wfile.removeIndices(packsToRemove);
+            wfile.writePacks(manager.getAll(names));
+            reopenWorld(world);
+        }
+    };
+
+    bool hasIndices = false;
     std::stringstream ss;
     if (content) {
         for (const auto& id : packsToRemove) {
@@ -323,53 +391,6 @@ void EngineController::reconfigPacks(
             }
         }
     }
-
-    runnable removeFunc = [this, controller, packsToAdd, packsToRemove, &contentControl]() {
-        auto& manager = contentControl.scan();
-        if (controller == nullptr) {
-            try {
-                auto names = PacksManager::getNames(
-                    engine.getContentControl().getContentPacks()
-                );
-                for (const auto& id : packsToAdd) {
-                    names.push_back(id);
-                }
-                for (const auto& id : packsToRemove) {
-                    manager.exclude(id);
-                    names.erase(std::find(names.begin(), names.end(), id));
-                }
-                names = manager.assemble(names);
-                engine.getContentControl().getContentPacks() = manager.getAll(names);
-            } catch (const contentpack_error& err) {
-                throw std::runtime_error(
-                    std::string(err.what()) + " [" + err.getPackId() + "]"
-                );
-            }
-        } else {
-            auto world = controller->getLevel()->getWorld();
-            auto& wfile = *world->wfile;
-            controller->saveWorld();
-
-            auto names = PacksManager::getNames(world->getPacks());
-            for (const auto& id : packsToAdd) {
-                names.push_back(id);
-            }
-            for (const auto& id : packsToRemove) {
-                manager.exclude(id);
-                const auto& found = std::find(names.begin(), names.end(), id);
-                if (found != names.end()) {
-                    names.erase(found);
-                } else {
-                    logger.warning()
-                        << "attempt to remove non-installed pack: " << id;
-                }
-            }
-            wfile.removeIndices(packsToRemove);
-            wfile.writePacks(manager.getAll(names));
-            reopenWorld(world);
-        }
-    };
-
     if (hasIndices && !engine.isHeadless()) {
         guiutil::confirm(
             engine,