diff --git a/res/content/base/scripts/grass_block.lua b/res/content/base/scripts/grass_block.lua
index f1072ab1..d92813c4 100644
--- a/res/content/base/scripts/grass_block.lua
+++ b/res/content/base/scripts/grass_block.lua
@@ -1,7 +1,7 @@
 function on_random_update(x, y, z)
     local dirtid = block_index('base:dirt');
     if is_solid_at(x, y+1, z) then
-        set_block(x, y, z, dirtid)
+        set_block(x, y, z, dirtid, 0)
     else
         local grassblockid = block_index('base:grass_block')
         for lx=-1,1 do
@@ -9,7 +9,7 @@ function on_random_update(x, y, z)
                 for lz=-1,1 do
                     if get_block(x + lx, y + ly, z + lz) == dirtid then
                         if not is_solid_at(x + lx, y + ly + 1, z + lz) then
-                            set_block(x + lx, y + ly, z + lz, grassblockid)
+                            set_block(x + lx, y + ly, z + lz, grassblockid, 0)
                             return
                         end
                     end
diff --git a/src/content/ContentLoader.cpp b/src/content/ContentLoader.cpp
index 93adae1a..75e5ff0e 100644
--- a/src/content/ContentLoader.cpp
+++ b/src/content/ContentLoader.cpp
@@ -143,6 +143,7 @@ Block* ContentLoader::loadBlock(std::string name, fs::path file) {
     root->flag("breakable", def->breakable);
     root->flag("selectable", def->selectable);
     root->flag("grounded", def->grounded);
+    root->flag("hidden", def->hidden);
     root->flag("sky-light-passing", def->skyLightPassing);
     root->num("draw-group", def->drawGroup);
 
diff --git a/src/frontend/hud.cpp b/src/frontend/hud.cpp
index 9e90824d..c6bf5d99 100644
--- a/src/frontend/hud.cpp
+++ b/src/frontend/hud.cpp
@@ -245,12 +245,15 @@ void HudRenderer::drawContentAccess(const GfxContext& ctx, Player* player) {
 		GfxContext subctx = ctx.sub();
 		subctx.depthTest(true);
 		subctx.cullFace(true);
+        uint index = 0;
 		for (uint i = 0; i < count-1; i++) {
 			Block* cblock = contentIds->getBlockDef(i+1);
 			if (cblock == nullptr)
 				break;
-			int x = xs + (icon_size+interval) * (i % inv_cols);
-			int y = ys + (icon_size+interval) * (i / inv_cols);
+            if (cblock->hidden)
+                continue;
+			int x = xs + (icon_size+interval) * (index % inv_cols);
+			int y = ys + (icon_size+interval) * (index / inv_cols);
 			if (mx > x && mx < x + (int)icon_size && my > y && my < y + (int)icon_size) {
 				tint.r *= 1.2f;
 				tint.g *= 1.2f;
@@ -262,6 +265,7 @@ void HudRenderer::drawContentAccess(const GfxContext& ctx, Player* player) {
 				tint = vec4(1.0f);
 			}
 			blocksPreview->draw(cblock, x, y, icon_size, tint);
+            index++;
 		}
 	}
 	uiShader->use();
@@ -338,7 +342,6 @@ void HudRenderer::draw(const GfxContext& ctx){
 		Block* cblock = contentIds->getBlockDef(player->chosenBlock);
 		assert(cblock != nullptr);
 		blocksPreview->draw(cblock, width - 56, uicamera->getFov() - 56, 48, vec4(1.0f));
-		//drawBlockPreview(cblock, width - 56, uicamera->fov - 56, 48, 48, vec4(1.0f));
 	}
 	uishader->use();
 	batch->begin();
diff --git a/src/logic/scripting/api_lua.cpp b/src/logic/scripting/api_lua.cpp
index d39796ac..14d878b7 100644
--- a/src/logic/scripting/api_lua.cpp
+++ b/src/logic/scripting/api_lua.cpp
@@ -43,7 +43,8 @@ int l_set_block(lua_State* L) {
     int y = lua_tointeger(L, 2);
     int z = lua_tointeger(L, 3);
     int id = lua_tointeger(L, 4);    
-    scripting::level->chunks->set(x, y, z, id, 0);
+    int states = lua_tointeger(L, 5);
+    scripting::level->chunks->set(x, y, z, id, states);
     scripting::level->lighting->onBlockSet(x,y,z, id);
     return 0;
 }
@@ -74,6 +75,24 @@ int l_set_player_pos(lua_State* L) {
     return 0;
 }
 
+int l_get_block_states(lua_State* L) {
+    int x = lua_tointeger(L, 1);
+    int y = lua_tointeger(L, 2);
+    int z = lua_tointeger(L, 3);
+    voxel* vox = scripting::level->chunks->get(x, y, z);
+    int states = vox == nullptr ? 0 : vox->states;
+    lua_pushinteger(L, states);
+    return 1;
+}
+
+int l_is_replaceable_at(lua_State* L) {
+    int x = lua_tointeger(L, 1);
+    int y = lua_tointeger(L, 2);
+    int z = lua_tointeger(L, 3);
+
+    lua_pushboolean(L, scripting::level->chunks->isReplaceable(x, y, z));
+    return 1;
+}
 
 #define lua_addfunc(L, FUNC, NAME) (lua_pushcfunction(L, FUNC),\
                                     lua_setglobal(L, NAME))
@@ -83,8 +102,10 @@ void apilua::create_funcs(lua_State* L) {
     lua_addfunc(L, l_block_name, "block_name");
     lua_addfunc(L, l_blocks_count, "blocks_count");
     lua_addfunc(L, l_is_solid_at, "is_solid_at");
+    lua_addfunc(L, l_is_replaceable_at, "is_replaceable_at");
     lua_addfunc(L, l_set_block, "set_block");
     lua_addfunc(L, l_get_block, "get_block");
     lua_addfunc(L, l_get_player_pos, "get_player_pos");
     lua_addfunc(L, l_set_player_pos, "set_player_pos");
+    lua_addfunc(L, l_get_block_states, "get_block_states");
 }
diff --git a/src/voxels/Block.h b/src/voxels/Block.h
index 7646adb1..98214be7 100644
--- a/src/voxels/Block.h
+++ b/src/voxels/Block.h
@@ -80,6 +80,7 @@ public:
 	bool breakable = true;
 	bool rotatable = false;
     bool grounded = false;
+    bool hidden = false;
 	AABB hitbox;
 	BlockRotProfile rotations;
 
diff --git a/src/voxels/Chunks.cpp b/src/voxels/Chunks.cpp
index 3d88575d..7877b3ed 100644
--- a/src/voxels/Chunks.cpp
+++ b/src/voxels/Chunks.cpp
@@ -97,6 +97,13 @@ bool Chunks::isSolid(int x, int y, int z) {
     return contentIds->getBlockDef(v->id)->rt.solid;
 }
 
+bool Chunks::isReplaceable(int x, int y, int z) {
+    voxel* v = get(x, y, z);
+    if (v == nullptr)
+        return false;
+    return contentIds->getBlockDef(v->id)->replaceable;
+}
+
 ubyte Chunks::getLight(int x, int y, int z, int channel){
 	x -= ox * CHUNK_W;
 	z -= oz * CHUNK_D;
diff --git a/src/voxels/Chunks.h b/src/voxels/Chunks.h
index 609971e4..4b6a76d4 100644
--- a/src/voxels/Chunks.h
+++ b/src/voxels/Chunks.h
@@ -55,6 +55,7 @@ public:
 
 	const AABB* isObstacle(float x, float y, float z);
     bool isSolid(int x, int y, int z);
+    bool isReplaceable(int x, int y, int z);
 
 	// does not move chunks inside
 	void _setOffset(int x, int z);