diff --git a/code/game/src/debug_ui_actions.c b/code/game/src/debug_ui_actions.c
index 848b64f..40e892f 100644
--- a/code/game/src/debug_ui_actions.c
+++ b/code/game/src/debug_ui_actions.c
@@ -21,7 +21,7 @@ ActSpawnCar(void) {
 
 void
 ActSpawnIcemaker(void) {
-    ecs_entity_t e = item_spawn(IKIND_DEMO_ICEMAKER, 1);
+    ecs_entity_t e = item_spawn(IKIND_DEMO_ICEMAKER, 32);
     ecs_entity_t plr = camera_get().ent_id;
     
     Position const* origin = ecs_get(world_ecs(), plr, Position);
@@ -63,7 +63,7 @@ ActPlaceIceRink(void) {
     for (int y = 0; y < 100; y++) {
         for (int x = 0; x < 100; x++) {
             world_block_lookup l = world_block_from_realpos((p->x - (x*bs)/2.0f), p->y - (y*bs)/2.0f);
-            world_chunk_replace_outer_block(l.chunk_id, l.id, watr_id);
+            world_chunk_replace_block(l.chunk_id, l.id, watr_id);
         }
     }
     
@@ -79,7 +79,7 @@ ActEraseWorldChanges(void) {
     for (int y = 0; y < 100; y++) {
         for (int x = 0; x < 100; x++) {
             world_block_lookup l = world_block_from_realpos((p->x - (x*bs)/2.0f), p->y - (y*bs)/2.0f);
-            world_chunk_replace_outer_block(l.chunk_id, l.id, 0);
+            world_chunk_place_block(l.chunk_id, l.id, 0);
         }
     }
     
diff --git a/code/game/src/items.c b/code/game/src/items.c
index a4178f6..d9de061 100644
--- a/code/game/src/items.c
+++ b/code/game/src/items.c
@@ -38,8 +38,8 @@ void item_use(ecs_world_t *ecs, ItemDrop *it, Position p) {
     switch (item_get_usage(item_id)) {
         case UKIND_PLACE:{
             world_block_lookup l = world_block_from_realpos(p.x, p.y);
-            world_chunk_replace_outer_block(l.chunk_id, l.id, blocks_find(desc->place.biome, desc->place.kind)); 
-            it->quantity--;
+            if (world_chunk_place_block(l.chunk_id, l.id, blocks_find(desc->place.biome, desc->place.kind)) )
+                it->quantity--;
         }break;
     }
 }
diff --git a/code/game/src/items_list.c b/code/game/src/items_list.c
index ef7817b..b1f2b41 100644
--- a/code/game/src/items_list.c
+++ b/code/game/src/items_list.c
@@ -5,7 +5,7 @@ static item_desc items[] = {
         .kind = IKIND_DEMO_ICEMAKER,
         .usage = UKIND_PLACE,
         .asset = ASSET_DEMO_ICEMAKER,
-        .max_quantity = 4,
+        .max_quantity = 64,
         
         .place = {
             .biome = BLOCK_BIOME_DEV,
diff --git a/code/game/src/world/world.c b/code/game/src/world/world.c
index 05017d5..61bbcf5 100644
--- a/code/game/src/world/world.c
+++ b/code/game/src/world/world.c
@@ -418,10 +418,12 @@ void world_chunk_replace_block(int64_t id, uint16_t block_idx, uint8_t block_id)
     world_chunk_mark_dirty(world.chunk_mapping[id]);
 }
 
-void world_chunk_replace_outer_block(int64_t id, uint16_t block_idx, uint8_t block_id) {
+bool world_chunk_place_block(int64_t id, uint16_t block_idx, uint8_t block_id) {
     ZPL_ASSERT(block_idx >= 0 && block_idx < zpl_square(world.chunk_size));
+    if (world.outer_block_mapping[id][block_idx] != 0 && block_id != 0) return false;
     world.outer_block_mapping[id][block_idx] = block_id;
     world_chunk_mark_dirty(world.chunk_mapping[id]);
+    return true;
 }
 
 uint8_t *world_chunk_get_blocks(int64_t id) {
diff --git a/code/game/src/world/world.h b/code/game/src/world/world.h
index 02aa4f8..b9ca930 100644
--- a/code/game/src/world/world.h
+++ b/code/game/src/world/world.h
@@ -77,7 +77,7 @@ world_block_lookup world_block_from_index(int64_t id, uint16_t block_idx);
 int64_t world_chunk_from_realpos(float x, float y);
 int64_t world_chunk_from_entity(ecs_entity_t id);
 void world_chunk_replace_block(int64_t id, uint16_t block_idx, uint8_t block_id);
-void world_chunk_replace_outer_block(int64_t id, uint16_t block_idx, uint8_t block_id);
+bool world_chunk_place_block(int64_t id, uint16_t block_idx, uint8_t block_id);
 uint8_t *world_chunk_get_blocks(int64_t id);
 void world_chunk_mark_dirty(ecs_entity_t e);
 uint8_t world_chunk_is_dirty(ecs_entity_t e);
diff --git a/code/modules/source/system_demo.c b/code/modules/source/system_demo.c
index 92d0196..23d7fe3 100644
--- a/code/modules/source/system_demo.c
+++ b/code/modules/source/system_demo.c
@@ -10,17 +10,3 @@ void DemoNPCMoveAround(ecs_iter_t *it) {
         v[i].y += (v[i].y*d*DEMO_NPC_MOVE_SPEED + zpl_sin(zpl_to_radians(rand()%360))*DEMO_NPC_STEER_SPEED);
     }
 }
-
-void DemoPlaceIceBlock(ecs_iter_t *it) {
-    Input *in = ecs_column(it, Input, 1);
-    Position *p = ecs_column(it, Position, 2);
-    uint8_t watr_id = blocks_find(BLOCK_BIOME_DEV, BLOCK_KIND_WATER);
-    
-    for (int i = 0; i < it->count; i++) {
-        if (in[i].use) {
-            in[i].use = false;
-            world_block_lookup l = world_block_from_realpos(p[i].x, p[i].y);
-            world_chunk_replace_outer_block(l.chunk_id, l.id, watr_id); 
-        }
-    }
-}