diff --git a/data/gfx/tiles.png b/data/gfx/tiles.png
index 94cc695..993b8b0 100644
Binary files a/data/gfx/tiles.png and b/data/gfx/tiles.png differ
diff --git a/data/levels/1.csv b/data/levels/1.csv
index c249fcc..c5f894b 100644
--- a/data/levels/1.csv
+++ b/data/levels/1.csv
@@ -1,9 +1,11 @@
-1,1,1,1,1,1,1,1
-1,0,0,0,0,0,0,1
-1,0,0,0,0,0,0,1
-1,0,0,0,0,0,0,1
-1,2,0,0,0,0,0,1
-1,1,0,1,1,0,1,1
-1,1,0,0,0,0,1,1
-1,1,0,0,0,0,1,1
-1,1,1,1,1,1,1,1
+1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1
+1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1
+1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1
+1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1
+1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1
+1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1
+1,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1
+1,1,1,1,3,3,1,1,1,1,1,3,3,1,1,1,1
+1,1,1,1,3,3,3,3,3,3,3,3,3,1,1,1,1
+1,1,1,1,3,3,3,3,3,3,3,3,3,1,1,1,1
+1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1
diff --git a/src/level.nim b/src/level.nim
index 4ae9550..171c8cd 100644
--- a/src/level.nim
+++ b/src/level.nim
@@ -14,6 +14,8 @@ const
   AirTile* = 0
   WallTile* = 1
   PlayerTile* = 2
+  SecretTileClosed* = 3
+  SecretTileOpen* = 4
 
 type
   Level* = ref object of TileMap
@@ -24,7 +26,7 @@ proc init*(level: Level, number: Positive) =
   level.graphic = gfxData["tiles"]
   level.initSprite(TileDim)
   level.map = loadCSV[int](&"data/levels/{number}.csv", parseInt)
-  level.passable.add @[AirTile, PlayerTile]
+  level.passable.add @[AirTile, PlayerTile, SecretTileOpen]
   level.onlyReachableColliders = true
   level.initCollider()
 
diff --git a/src/main.nim b/src/main.nim
index 237d95b..3b255d1 100644
--- a/src/main.nim
+++ b/src/main.nim
@@ -1,6 +1,7 @@
 import
+  sequtils,
+  sugar,
   nimgame2 / [
-    assets,
     entity,
     input,
     nimgame,
@@ -53,9 +54,20 @@ method event*(scene: MainScene, event: Event) =
 
 method update*(scene: MainScene, elapsed: float) =
   scene.updateScene(elapsed)
-  if ScancodeUp.pressed or ScancodeW.pressed or ScancodeSpace.pressed:
-    scene.player.jump()
+  if ScancodeUp.pressed or ScancodeW.pressed:
+    scene.player.jump
   if ScancodeRight.down or ScancodeD.down:
     scene.player.right(elapsed)
   if ScancodeLeft.down or ScancodeA.down:
     scene.player.left(elapsed)
+  if ScanCodeSpace.pressed:
+    scene.level.map = scene.level.map.map(row => row.map(tile => (
+      case tile
+      of SecretTileClosed:
+        SecretTileOpen
+      of SecretTileOpen:
+        SecretTileClosed
+      else:
+        tile
+    )))
+    scene.level.initCollider