diff --git a/assets/buildings.png b/assets/buildings.png
index 3fd9e71..0ebf60a 100644
Binary files a/assets/buildings.png and b/assets/buildings.png differ
diff --git a/assets/maps/test.tmj b/assets/maps/test.tmj
index 3d0f636..6d6b698 100644
--- a/assets/maps/test.tmj
+++ b/assets/maps/test.tmj
@@ -309,6 +309,67 @@
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+            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+         "height":50,
+         "id":32,
+         "name":"BuildingOwnership",
+         "opacity":0.6,
+         "type":"tilelayer",
+         "visible":true,
+         "width":80,
+         "x":0,
+         "y":0
+        }, 
         {
          "draworder":"topdown",
          "id":31,
@@ -343,8 +404,8 @@
          "x":0,
          "y":0
         }],
- "nextlayerid":32,
- "nextobjectid":19727,
+ "nextlayerid":33,
+ "nextobjectid":19728,
  "orientation":"orthogonal",
  "renderorder":"right-down",
  "tiledversion":"1.10.2",
diff --git a/engine/breeze/game.h b/engine/breeze/game.h
index 5cb94ef..33dcf27 100644
--- a/engine/breeze/game.h
+++ b/engine/breeze/game.h
@@ -107,14 +107,18 @@ int main(int argc, const char **argv) {
     }
 
     while (!WindowShouldClose()) {
+        float dt = GetFrameTime();
         if (NK)
             UpdateNuklear(NK);
         if (appDesc.update)
-            appDesc.update(0.0f, appDesc.userData);
+            appDesc.update(dt, appDesc.userData);
+
+        if (ECS)
+            ecs_progress(ECS, dt);
 
         BeginDrawing();
         if (appDesc.render)
-            appDesc.render(0.0f, appDesc.userData);
+            appDesc.render(dt, appDesc.userData);
         if (NK)
             DrawNuklear(NK);
         EndDrawing();
diff --git a/engine/breeze/map/map.c b/engine/breeze/map/map.c
index 79bf46f..6e072dd 100644
--- a/engine/breeze/map/map.c
+++ b/engine/breeze/map/map.c
@@ -1,5 +1,6 @@
 #include "map.h"
 
+#include "../core/logger.h"
 #include "../core/memory.h"
 #include "../math/vec2i.h"
 
@@ -8,6 +9,15 @@
 
 BzTileMap BZ_TILEMAP_INVALID = {.isValid = false};
 
+bool bzTileLayerClear(BzTileLayer *layer, BzTile *data, i32 dataCount) {
+    return true;
+}
+bool bzTileObjectsClear(BzTileObjectGroup *objectGroup, BzTileObject *objects, i32 objectCount) {
+    return true;
+}
+
+BzTileLayerFunc BZ_TILE_LAYER_CLEAR = bzTileLayerClear;
+BzTileObjectsFunc BZ_TILE_OBJECTS_CLEAR = bzTileObjectsClear;
 
 int16_t bzTileLayerGetTile(BzTileLayer *layer, i32 x, i32 y) {
     return layer->data[layer->width * y + x];
@@ -19,9 +29,9 @@ static void handleTileLayer(BzTileLayer *layer, cute_tiled_layer_t *cuteLayer) {
     layer->data = NULL;
     if (layer->dataCount > 0) {
         layer->data = bzAlloc(layer->dataCount * sizeof(*layer->data));
-        layer->minData = layer->maxData = (i16) cuteLayer->data[0];
+        layer->minData = layer->maxData = (BzTile) cuteLayer->data[0];
         for (i32 i = 0; i < layer->dataCount; i++) {
-            layer->data[i] = (i16) cuteLayer->data[i];
+            layer->data[i] = (BzTile) cuteLayer->data[i];
             if (layer->data[i] < layer->minData)
                 layer->minData = layer->data[i];
             else if (layer->data[i] > layer->maxData)
@@ -41,7 +51,7 @@ static void handleTileLayer(BzTileLayer *layer, cute_tiled_layer_t *cuteLayer) {
 // tileset.c
 BzTileShape bzCuteObjectToTileShape(cute_tiled_object_t *object);
 
-static void handleTileObjectLayer(BzTileObjectLayer *layer, cute_tiled_layer_t *cuteLayer,
+static void handleTileObjectLayer(BzTileObjectGroup *layer, cute_tiled_layer_t *cuteLayer,
                                   BzStringHashFunc hashFunc) {
     // Count objects
     layer->objectCount = 0;
@@ -61,12 +71,9 @@ static void handleTileObjectLayer(BzTileObjectLayer *layer, cute_tiled_layer_t *
 
 }
 
-static void createColliders(BzTileMap *map) {
-    map->collidersCount = map->width * map->height;
-    map->colliderMap = bzAlloc(map->collidersCount * sizeof(*map->colliderMap));
-    for (i32 i = 0; i < map->collidersCount; i++) {
-        map->colliderMap[i] = (BzTileCollider) {{BZ_TILE_SHAPE_NONE}};
-    }
+static void updateColliders(BzTileMap *map, i32 startX, i32 startY, i32 endX, i32 endY) {
+    BZ_ASSERT(startX >= 0 && endX <= map->width &&
+              startY >= 0 && endY <= map->height);
 
     // Top-most layer takes priority
     for (i32 i = map->layerCount - 1; i >= 0; i--) {
@@ -74,8 +81,8 @@ static void createColliders(BzTileMap *map) {
         if (!layer->data) continue;
         if (layer->tilesetIdx == -1) continue;
         BzTileset *tileset = map->tilesets + layer->tilesetIdx;
-        for (i32 y = 0; y < map->height; y++) {
-            for (i32 x = 0; x < map->width; x++) {
+        for (i32 y = startY; y < endY; y++) {
+            for (i32 x = startX; x < endX; x++) {
                 i32 tile = bzTileLayerGetTile(layer, x, y);
                 BzTileShape tilesetShape = bzTilesetGetTileCollider(tileset, tile);
                 if (tilesetShape.type == BZ_TILE_SHAPE_NONE ||
@@ -99,6 +106,16 @@ static void createColliders(BzTileMap *map) {
     }
 }
 
+static void createColliders(BzTileMap *map) {
+    map->collidersCount = map->width * map->height;
+    map->colliderMap = bzAlloc(map->collidersCount * sizeof(*map->colliderMap));
+    for (i32 i = 0; i < map->collidersCount; i++) {
+        map->colliderMap[i] = (BzTileCollider) {{BZ_TILE_SHAPE_NONE}};
+    }
+
+    updateColliders(map, 0, 0, map->width, map->height);
+}
+
 BzTileMap bzTileMapCreate(const BzTileMapDesc *desc) {
     BzTileMap map = {};
     // Auto detect tileset count.
@@ -123,13 +140,13 @@ BzTileMap bzTileMapCreate(const BzTileMapDesc *desc) {
     cute_tiled_layer_t *cuteLayer = cuteMap->layers;
     while (cuteLayer) {
         BZ_ASSERT(map.layerCount < BZ_MAX_MAP_LAYERS);
-        BZ_ASSERT(map.objectLayerCount < BZ_MAX_MAP_LAYERS);
+        BZ_ASSERT(map.objectGroupCount < BZ_MAX_MAP_LAYERS);
 
         // Find slot
         i32 slot = -1;
         for (i32 i = 0; i < BZ_MAX_MAP_LAYERS; i++) {
             const BzTileLayerDesc *layerDesc = desc->layers + i;
-            const BzTileObjectsDesc *objectsDesc = desc->objectLayers + i;
+            const BzTileObjectsDesc *objectsDesc = desc->objectGroups + i;
             if (layerDesc->name && strcmp(layerDesc->name, cuteLayer->name.ptr) == 0 ||
                 objectsDesc->name && strcmp(objectsDesc->name, cuteLayer->name.ptr) == 0) {
                 slot = i;
@@ -139,33 +156,25 @@ BzTileMap bzTileMapCreate(const BzTileMapDesc *desc) {
             }
         }
         if (slot == -1) {
+            bzLogWarning("Dangling layer: %s", cuteLayer->name.ptr);
             cuteLayer = cuteLayer->next;
             continue;
         }
 
         if (cuteLayer->data) {
             BzTileLayer *layer = map.layers + slot;
-            const BzTileLayerDesc *layerDesc = desc->layers + slot;
+            layer->desc = desc->layers[slot];
             handleTileLayer(layer, cuteLayer);
-            if (layerDesc->handler && !layerDesc->handler(layer)) {
-                bzFree(layer->data);
-                layer->data = NULL;
-                layer->dataCount = 0;
-            }
+            layer->hasOwnership = true;
             map.layerCount++;
         } else {
-            BzTileObjectLayer *objectLayer = map.objectLayers + slot;
-            const BzTileObjectsDesc *objectLayerDesc = desc->objectLayers + slot;
-            BzStringHashFunc *hashFunc = objectLayerDesc->hashFunc;
-            if (!hashFunc)
-                hashFunc = bzStringDefaultHash;
-            handleTileObjectLayer(objectLayer, cuteLayer, hashFunc);
-            if (objectLayerDesc->handler && !objectLayerDesc->handler(objectLayer)) {
-                bzFree(objectLayer->objects);
-                objectLayer->objects = NULL;
-                objectLayer->objectCount = 0;
-            }
-            map.objectLayerCount++;
+            BzTileObjectGroup *objectGroup = map.objectGroups + slot;
+            objectGroup->desc = desc->objectGroups[slot];
+            if (!objectGroup->desc.hashFunc)
+                objectGroup->desc.hashFunc = bzStringDefaultHash;
+            handleTileObjectLayer(objectGroup, cuteLayer, objectGroup->desc.hashFunc);
+
+            map.objectGroupCount++;
         }
 
         cuteLayer = cuteLayer->next;
@@ -197,7 +206,6 @@ BzTileMap bzTileMapCreate(const BzTileMapDesc *desc) {
             }
         }
     }
-
     cute_tiled_free_map(cuteMap);
 
     createColliders(&map);
@@ -206,28 +214,62 @@ BzTileMap bzTileMapCreate(const BzTileMapDesc *desc) {
     return map;
 }
 
-void bzTileMapDestroy(BzTileMap *tilemap) {
-    for (i32 i = 0; i < tilemap->layerCount; i++) {
-        BzTileLayer *layer = tilemap->layers + i;
-        if (layer->data) {
+void bzTileMapDestroy(BzTileMap *map) {
+    for (i32 i = 0; i < map->layerCount; i++) {
+        BzTileLayer *layer = map->layers + i;
+        if (layer->hasOwnership && layer->data) {
             bzFree(layer->data);
             layer->data = NULL;
             layer->dataCount = 0;
         }
     }
-    for (i32 i = 0; i < tilemap->objectLayerCount; i++) {
-        BzTileObjectLayer *objectLayer = tilemap->objectLayers + i;
-        if (objectLayer->objects) {
+    for (i32 i = 0; i < map->objectGroupCount; i++) {
+        BzTileObjectGroup *objectLayer = map->objectGroups + i;
+        if (objectLayer->hasOwnership && objectLayer->objects) {
             bzFree(objectLayer->objects);
             objectLayer->objects = NULL;
             objectLayer->objectCount = 0;
         }
     }
 
-    bzFree(tilemap->colliderMap);
-    tilemap->collidersCount = 0;
+    bzFree(map->colliderMap);
+    map->collidersCount = 0;
 
-    *tilemap = BZ_TILEMAP_INVALID;
+    *map = BZ_TILEMAP_INVALID;
+}
+
+void bzTileMapOverrideLayer(BzTileMap *map, i32 slotID, BzTileLayerFunc func) {
+    BZ_ASSERT(slotID >= 0 && slotID < map->layerCount);
+    BzTileLayer *layer = map->layers + slotID;
+    i32 dataCount = layer->dataCount;
+    BzTile *data = layer->data;
+    if (func(layer, data, dataCount)) {
+        if (!layer->hasOwnership) return;
+        bzFree(layer->data);
+        if (layer->data == data) {
+            layer->data = NULL;
+            layer->dataCount = 0;
+        }
+        layer->hasOwnership = false;
+    } else {
+        BZ_ASSERT(data == layer->data && dataCount == layer->dataCount);
+    }
+}
+void bzTileMapOverrideObjectGroup(BzTileMap *map, i32 slotID, BzTileObjectsFunc func) {
+    BZ_ASSERT(slotID >= 0 && slotID < map->objectGroupCount);
+    BzTileObjectGroup *objectGroup = map->objectGroups + slotID;
+    BzTileObject *objects = objectGroup->objects;
+    i32 objectCount = objectGroup->objectCount;
+    if (func(objectGroup, objects, objectCount)) {
+        bzFree(objectGroup->objects);
+        if (objectGroup->objects == objects) {
+            objectGroup->objects = NULL;
+            objectGroup->objectCount = 0;
+        }
+        objectGroup->hasOwnership = false;
+    } else {
+        BZ_ASSERT(objects == objectGroup->objects && objectCount == objectGroup->objectCount);
+    }
 }
 
 
@@ -238,7 +280,7 @@ static void drawLayer(BzTileLayer *layer, BzTileset *tileset) {
 
     for (i32 y = 0; y < layer->height; y++) {
         for (i32 x = 0; x < layer->width; x++) {
-            i16 tile = bzTileLayerGetTile(layer, x, y);
+            BzTile tile = bzTileLayerGetTile(layer, x, y);
             if (tile - tileset->startID != -1) {
                 Rectangle rec = bzTilesetGetTileRegion(tileset, tile);
                 DrawTextureRec(tileset->tiles, rec, drawPos, WHITE);
@@ -251,7 +293,7 @@ static void drawLayer(BzTileLayer *layer, BzTileset *tileset) {
 
 }
 
-static void drawObjectLayer(BzTileObjectLayer *objectLayer) {
+static void drawObjectLayer(BzTileObjectGroup *objectLayer) {
     Color color = ORANGE;
     for (int i = 0; i < objectLayer->objectCount; i++) {
         BzTileShape shape = objectLayer->objects[i].shape;
@@ -282,8 +324,8 @@ void bzTileMapDraw(BzTileMap *map) {
         drawLayer(map->layers + i, tileset);
     }
 
-    for (i32 i = 0; i < map->objectLayerCount; i++) {
-        BzTileObjectLayer *objectLayer = map->objectLayers + i;
+    for (i32 i = 0; i < map->objectGroupCount; i++) {
+        BzTileObjectGroup *objectLayer = map->objectGroups + i;
         if (!objectLayer->objects) continue;
         drawObjectLayer(objectLayer);
     }
@@ -324,6 +366,13 @@ void bzTileMapDrawColliders(BzTileMap *map) {
     }
 }
 
+void bzTileMapUpdateCollider(BzTileMap *map, i32 x, i32 y) {
+    i32 idx = y * map->width + x;
+    BZ_ASSERT(idx >= 0 && idx < map->collidersCount);
+    map->colliderMap[idx] = (BzTileCollider){};
+    updateColliders(map, x, y, x + 1, y + 1);
+}
+
 BzTileCollider bzTileMapGetCollider(BzTileMap *map, i32 x, i32 y) {
     i32 idx = y * map->width + x;
     if (idx < 0 || idx >= map->collidersCount) {
diff --git a/engine/breeze/map/map.h b/engine/breeze/map/map.h
index 8d42870..31fc91b 100644
--- a/engine/breeze/map/map.h
+++ b/engine/breeze/map/map.h
@@ -8,14 +8,38 @@
 #define BZ_MAX_MAP_TILESETS 8
 #define BZ_MAP_COLLIDER_DEPTH 2
 
+typedef struct BzTileLayer BzTileLayer;
+typedef struct BzTileObject BzTileObject;
+typedef struct BzTileObjectGroup BzTileObjectGroup;
+
+typedef void (*BzTileLayerRenderFunc)(BzTileLayer *layer);
+typedef void (*BzTileObjectGroupRenderFunc)(BzTileObjectGroup *objectGroup);
+
+typedef struct BzTileLayerDesc {
+    const char *name; // Matches map layer names
+    BzTileLayerRenderFunc renderer;
+} BzTileLayerDesc;
+typedef struct BzTileObjectsDesc {
+    const char *name; // Matches map layer names
+    BzTileObjectGroupRenderFunc renderer;
+    BzStringHashFunc hashFunc;
+} BzTileObjectsDesc;
+
+typedef struct BzTileMapDesc {
+    const char *path;
+    BzTileset tilesets[BZ_MAX_MAP_TILESETS];
+
+    BzTileLayerDesc layers[BZ_MAX_MAP_LAYERS];
+    BzTileObjectsDesc objectGroups[BZ_MAX_MAP_LAYERS];
+} BzTileMapDesc;
 
 typedef struct BzTileLayer {
     i32 id;
 
-    int16_t *data;
+    BzTile *data;
     i32 dataCount;
-    i16 minData;
-    i16 maxData;
+    BzTile minData;
+    BzTile maxData;
 
     i32 width;
     i32 height;
@@ -26,47 +50,23 @@ typedef struct BzTileLayer {
 
     i32 tilesetIdx;
 
-    void *userData;
+    BzTileLayerDesc desc;
+    bool hasOwnership;
 } BzTileLayer;
 
 typedef struct BzTileObject {
     u32 id;
     BzTileShape shape;
-
-    void *userData;
 } BzTileObject;
 
-typedef struct BzTileObjectLayer {
+typedef struct BzTileObjectGroup {
     BzTileObject *objects;
     i32 objectCount;
-} BzTileObjectLayer;
 
-// Return true, if you want to keep data allocated
-typedef bool BzTileLayerFunc(BzTileLayer *layer);
-typedef bool BzTileObjectsFunc(BzTileObjectLayer *objectLayer);
+    BzTileObjectsDesc desc;
+    bool hasOwnership;
+} BzTileObjectGroup;
 
-typedef void BzTileLayerRenderFunc(BzTileLayer *layer);
-typedef void BzTileObjectsRenderFunc(BzTileObjectLayer *objectLayer);
-
-typedef struct BzTileLayerDesc {
-    const char *name; // Matches map layer names
-    BzTileLayerFunc *handler;
-    BzTileLayerRenderFunc *renderer;
-} BzTileLayerDesc;
-typedef struct BzTileObjectsDesc {
-    const char *name; // Matches map layer names
-    BzTileObjectsFunc *handler;
-    BzTileObjectsRenderFunc *renderer;
-    BzStringHashFunc *hashFunc;
-} BzTileObjectsDesc;
-
-typedef struct BzTileMapDesc {
-    const char *path;
-    BzTileset tilesets[BZ_MAX_MAP_TILESETS];
-
-    BzTileLayerDesc layers[BZ_MAX_MAP_LAYERS];
-    BzTileObjectsDesc objectLayers[BZ_MAX_MAP_LAYERS];
-} BzTileMapDesc;
 
 typedef struct BzTileCollider {
     BzTileShape shapes[BZ_MAP_COLLIDER_DEPTH];
@@ -86,8 +86,8 @@ typedef struct BzTileMap {
     BzTileLayer layers[BZ_MAX_MAP_LAYERS];
     i32 layerCount;
 
-    BzTileObjectLayer objectLayers[BZ_MAX_MAP_LAYERS];
-    i32 objectLayerCount;
+    BzTileObjectGroup objectGroups[BZ_MAX_MAP_LAYERS];
+    i32 objectGroupCount;
 
     BzTileset tilesets[BZ_MAX_MAP_TILESETS];
     i32 tilesetCount;
@@ -97,14 +97,25 @@ typedef struct BzTileMap {
 
 extern BzTileMap BZ_TILEMAP_INVALID;
 
+// Return true, if you want to override data (you are responsible for cleanup, if you override)
+typedef bool (*BzTileLayerFunc)(BzTileLayer *layer, BzTile *data, i32 dataCount);
+typedef bool (*BzTileObjectsFunc)(BzTileObjectGroup *objectGroup, BzTileObject *objects, i32 objectsCount);
+
+extern BzTileLayerFunc BZ_TILE_LAYER_CLEAR;
+extern BzTileObjectsFunc BZ_TILE_OBJECTS_CLEAR;
+
 int16_t bzTileLayerGetTile(BzTileLayer *layer, i32 x, i32 y);
 
 BzTileMap bzTileMapCreate(const BzTileMapDesc *desc);
-void bzTileMapDestroy(BzTileMap *tilemap);
+void bzTileMapDestroy(BzTileMap *map);
+
+void bzTileMapOverrideLayer(BzTileMap *map, i32 slotID, BzTileLayerFunc func);
+void bzTileMapOverrideObjectGroup(BzTileMap *map, i32 slotID, BzTileObjectsFunc func);
 
 void bzTileMapDraw(BzTileMap *map);
 void bzTileMapDrawColliders(BzTileMap *map);
 BzTileCollider bzTileMapGetCollider(BzTileMap *map, i32 x, i32 y);
+void bzTileMapUpdateCollider(BzTileMap *map, i32 x, i32 y);
 
 
 
diff --git a/engine/breeze/map/tileset.c b/engine/breeze/map/tileset.c
index fac7cf5..5b37267 100644
--- a/engine/breeze/map/tileset.c
+++ b/engine/breeze/map/tileset.c
@@ -78,7 +78,7 @@ BzTileset bzTilesetCreate(const BzTilesetDesc *desc) {
     return tileset;
 }
 
-Rectangle bzTilesetGetTileRegion(BzTileset *tileset, int tileID) {
+Rectangle bzTilesetGetTileRegion(BzTileset *tileset, BzTile tileID) {
     tileID = tileID - tileset->startID;
     if (tileID < 0 || tileID >= tileset->tileCount) {
         return (Rectangle){};
@@ -88,7 +88,7 @@ Rectangle bzTilesetGetTileRegion(BzTileset *tileset, int tileID) {
     return (Rectangle) {posX * tileset->tileWidth, posY * tileset->tileHeight,
                         tileset->tileWidth, tileset->tileHeight};
 }
-BzTileShape bzTilesetGetTileCollider(BzTileset *tileset, int tileID) {
+BzTileShape bzTilesetGetTileCollider(BzTileset *tileset, BzTile tileID) {
     tileID = tileID - tileset->startID;
 
     if (tileID < 0 || tileID >= tileset->tileCount) {
diff --git a/engine/breeze/map/tileset.h b/engine/breeze/map/tileset.h
index a23bb5c..bc48bcb 100644
--- a/engine/breeze/map/tileset.h
+++ b/engine/breeze/map/tileset.h
@@ -5,6 +5,8 @@
 
 #include <raylib.h>
 
+typedef i16 BzTile;
+
 typedef struct BzTilesetDesc {
     const char *path;
     const char *texturePath;
@@ -44,8 +46,8 @@ extern BzTileset BZ_TILESET_INVALID;
 
 BzTileset bzTilesetCreate(const BzTilesetDesc *desc);
 
-Rectangle bzTilesetGetTileRegion(BzTileset *tileset, int tileID);
-BzTileShape bzTilesetGetTileCollider(BzTileset *tileset, int tileID);
+Rectangle bzTilesetGetTileRegion(BzTileset *tileset, BzTile tileID);
+BzTileShape bzTilesetGetTileCollider(BzTileset *tileset, BzTile tileID);
 
 void bzTilesetDestroy(BzTileset *tileset);
 
diff --git a/engine/breeze/utils/string.h b/engine/breeze/utils/string.h
index ed60e6f..7e75243 100644
--- a/engine/breeze/utils/string.h
+++ b/engine/breeze/utils/string.h
@@ -3,7 +3,7 @@
 
 #include "../defines.h"
 
-typedef u32 BzStringHashFunc(const char *str);
+typedef u32 (*BzStringHashFunc)(const char *str);
 
 // djb2 hash algorithm
 // From: https://stackoverflow.com/questions/7666509/hash-function-for-string
diff --git a/game/components.h b/game/components.h
new file mode 100644
index 0000000..6fb8286
--- /dev/null
+++ b/game/components.h
@@ -0,0 +1,11 @@
+#ifndef PIXELDEFENSE_COMPONENTS_H
+#define PIXELDEFENSE_COMPONENTS_H
+
+#include <breeze.h>
+
+typedef struct {
+    f32 x;
+    f32 y;
+} Position, Velocity;
+
+#endif //PIXELDEFENSE_COMPONENTS_H
diff --git a/game/main.c b/game/main.c
index ae4228d..4d28d8d 100644
--- a/game/main.c
+++ b/game/main.c
@@ -15,7 +15,7 @@ typedef struct Game {
 
 static Game GAME = {};
 
-bool handleGameObjects(BzTileObjectLayer *objectLayer) {
+bool handleGameObjects(BzTileObjectGroup *objectLayer, BzTileObject *objects, i32 objectCount) {
     for (i32 i = 0; i < objectLayer->objectCount; i++) {
         BzTileObject object = objectLayer->objects[i];
         if (bzStringDefaultHash("camera") == object.id) {
@@ -24,11 +24,19 @@ bool handleGameObjects(BzTileObjectLayer *objectLayer) {
             GAME.camera.target.y = object.shape.y;
         }
     }
-    return false;
+    return true;
 }
 
-bool handleBuildLayer(BzTileLayer *layer) {
-    return false;
+bool handleBuildLayer(BzTileLayer *layer, BzTile *data, i32 dataCount) {
+    for (i32 y = 0; y < layer->height; y++) {
+        for (i32 x = 0; x < layer->width; x++) {
+            BzTile *tile = data + y * layer->width + x;
+            if (*tile == 0) continue;
+            *tile = 0;
+            bzTileMapUpdateCollider(&GAME.map, x, y);
+        }
+    }
+    return true;
 }
 
 bool canBuildOn(BzTileMap *map, i32 tileX, i32 tileY, i32 sizeX, i32 sizeY) {
@@ -82,6 +90,20 @@ bool canBuildOn(BzTileMap *map, i32 tileX, i32 tileY, i32 sizeX, i32 sizeY) {
     return true;
 }
 
+typedef enum Layers {
+    LAYER_TERRAIN = 0,
+    LAYER_FOLIAGE,
+    LAYER_TREES,
+    LAYER_TREES2,
+    LAYER_BUILDINGS,
+    LAYER_BUILDING_OWNER,
+} Layers;
+
+typedef enum ObjectGroup {
+    OBJECTS_GAME = 0,
+    OBJECTS_ENTITIES,
+} ObjectGroup;
+
 bool init(Game *game) {
     int screenWidth = 1280;
     int screenHeight = 720;
@@ -106,16 +128,23 @@ bool init(Game *game) {
         .tilesets[0]=game->terrainTileset,
         .tilesets[1]=game->buildingsTileset,
 
-        .layers[0]=(BzTileLayerDesc) {"Terrain", NULL},
-        .layers[1]=(BzTileLayerDesc) {"Foliage", NULL},
-        .layers[2]=(BzTileLayerDesc) {"Trees", NULL},
-        .layers[3]=(BzTileLayerDesc) {"TreesS", NULL},
-        .layers[4]=(BzTileLayerDesc) {"Buildings", handleBuildLayer},
+        .layers[LAYER_TERRAIN]=(BzTileLayerDesc) {"Terrain"},
+        .layers[LAYER_FOLIAGE]=(BzTileLayerDesc) {"Foliage"},
+        .layers[LAYER_TREES]=(BzTileLayerDesc) {"Trees"},
+        .layers[LAYER_TREES2]=(BzTileLayerDesc) {"TreesS"},
+        .layers[LAYER_BUILDINGS]=(BzTileLayerDesc) {"Buildings"},
+        .layers[LAYER_BUILDING_OWNER]=(BzTileLayerDesc) {"BuildingOwnership"},
 
-        .objectLayers[0]=(BzTileObjectsDesc) {"Game", handleGameObjects},
-        .objectLayers[1]=(BzTileObjectsDesc ) {"Entities", NULL}
+        .objectGroups[OBJECTS_GAME]=(BzTileObjectsDesc) {"Game"},
+        .objectGroups[OBJECTS_ENTITIES]=(BzTileObjectsDesc ) {"Entities"}
     });
 
+    bzTileMapOverrideLayer(&game->map, LAYER_BUILDINGS, handleBuildLayer);
+    bzTileMapOverrideLayer(&game->map, LAYER_BUILDING_OWNER, BZ_TILE_LAYER_CLEAR);
+
+    bzTileMapOverrideObjectGroup(&game->map, OBJECTS_GAME, handleGameObjects);
+    bzTileMapOverrideObjectGroup(&game->map, OBJECTS_ENTITIES, BZ_TILE_OBJECTS_CLEAR);
+
 
     return true;
 }
diff --git a/rawAssets/buildings.kra b/rawAssets/buildings.kra
index df3c310..97105c0 100644
Binary files a/rawAssets/buildings.kra and b/rawAssets/buildings.kra differ
diff --git a/rawAssets/buildings.png b/rawAssets/buildings.png
index 3fd9e71..0ebf60a 100644
Binary files a/rawAssets/buildings.png and b/rawAssets/buildings.png differ
diff --git a/rawAssets/buildings/owner_0.kra b/rawAssets/buildings/owner_0.kra
new file mode 100644
index 0000000..eaa02c7
Binary files /dev/null and b/rawAssets/buildings/owner_0.kra differ
diff --git a/rawAssets/buildings/owner_1.kra b/rawAssets/buildings/owner_1.kra
new file mode 100644
index 0000000..5e559ab
Binary files /dev/null and b/rawAssets/buildings/owner_1.kra differ
diff --git a/tiled/test.tmx b/tiled/test.tmx
index 8394f85..6249f7f 100644
--- a/tiled/test.tmx
+++ b/tiled/test.tmx
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<map version="1.10" tiledversion="1.10.2" orientation="orthogonal" renderorder="right-down" width="80" height="50" tilewidth="16" tileheight="16" infinite="0" nextlayerid="32" nextobjectid="19728">
+<map version="1.10" tiledversion="1.10.2" orientation="orthogonal" renderorder="right-down" width="80" height="50" tilewidth="16" tileheight="16" infinite="0" nextlayerid="33" nextobjectid="19728">
  <editorsettings>
   <export target="../assets/maps/test.tmj" format="json"/>
  </editorsettings>
@@ -273,6 +273,60 @@
 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+</data>
+ </layer>
+ <layer id="32" name="BuildingOwnership" width="80" height="50" opacity="0.6">
+  <data encoding="csv">
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