diff --git a/v5/Window.py b/v5/Window.py
index bf19eee..802d80c 100644
--- a/v5/Window.py
+++ b/v5/Window.py
@@ -4,47 +4,54 @@ CELL = 25
 HEIGHT = 600
 WIDTH = 900
 
-images = [
-  ["res/tiles_0.png", 0, 0, 75, 100],
-  ["res/tiles_0.png", 75, 0, 75, 100],
-  ["res/tiles_1.png", 0, 0, 75, 100],
-]
-positions = [
-  [9, 1],
-  [14, 1],
-  [19, 1],
-  [24, 1],
+class Context:
+  def __init__(self):
+    self.images = [
+      ["res/tiles_0.png", 0, 0, 75, 100],
+      ["res/tiles_0.png", 75, 0, 75, 100],
+      ["res/tiles_1.png", 0, 0, 75, 100],
+    ]
+
+    self.positions = [
+      [9, 1],
+      [14, 1],
+      [19, 1],
+      [24, 1],
 
-  [9, 7],
-  [14, 7],
-  [19, 7],
-  [24, 7],
+      [9, 7],
+      [14, 7],
+      [19, 7],
+      [24, 7],
 
-  [9, 13],
-  [14, 13],
-  [19, 13],
-  [24, 13],
+      [9, 13],
+      [14, 13],
+      [19, 13],
+      [24, 13],
 
-  [9, 19],
-  [14, 19],
-  [19, 19],
-  [24, 19],
-]
-textures = None
-deselected_tiles = []
-selected_tiles = []
+      [9, 19],
+      [14, 19],
+      [19, 19],
+      [24, 19],
+    ]
+    self.textures = None
+    self.deselected_tiles = None
+    self.selected_tiles = None
 
 class Window(arcade.Window):
   def __init__(self):
     super().__init__(WIDTH, HEIGHT, "OGS Memory")
     arcade.set_background_color(arcade.color.WHITE)
     self.all_sprites = arcade.SpriteList()
+    self.c = Context()
+    c = self.c
 
-    textures = load_textures(images)
-    deselected_tiles = create_deselected_tiles(positions, textures)
-    for t in deselected_tiles:
+    c.textures = load_textures(c.images)
+    c.deselected_tiles = create_deselected_tiles(c.positions, c.textures)
+    for t in c.deselected_tiles:
+      self.all_sprites.append(t)
+    c.selected_tiles = create_selected_tiles(c.positions, c.textures)
+    for t in c.selected_tiles:
       self.all_sprites.append(t)
-    #selected_tiles = create_selected_tiles(positions, textures)
 
   def on_draw(self):
     arcade.start_render()
@@ -53,8 +60,12 @@ class Window(arcade.Window):
   def on_mouse_press(self, x, y, button, key_modifiers):
     print("click", x, y)
     sprites = arcade.get_sprites_at_point([x, y], self.all_sprites)
-    if len(sprites) == 1:
-      print("selected: ", sprites[0].guid)
+    id = sprites[0].guid
+    print("selected id: ", id)
+    #print("deselected_tiles: ", self.c.deselected_tiles)
+    #print("selected_tiles: ", self.c.selected_tiles)
+    self.c.deselected_tiles[id].visible = False
+    self.c.selected_tiles[id].visible = True
 
   def on_update(self, delta):
     self.all_sprites.update_animation()
@@ -83,3 +94,17 @@ def create_deselected_tiles(positions, textures):
     tile.center_x = CELL * 2 + p[0] * CELL
     tile.center_y = HEIGHT - CELL * 2 - p[1] * CELL
   return tiles
+
+def create_selected_tiles(positions, textures):
+  tiles = []
+  for (id, p) in enumerate(positions):
+    tile = arcade.Sprite()
+    tiles.append(tile)
+    tile.guid = id
+    tile.texture = textures[2]
+    # Position.
+    tile.center_x = CELL * 2 + p[0] * CELL
+    tile.center_y = HEIGHT - CELL * 2 - p[1] * CELL
+    # Invisible by default.
+    tile.visible = False
+  return tiles