diff --git a/rats.py b/rats.py
index 42b940b..1b8e3a5 100644
--- a/rats.py
+++ b/rats.py
@@ -11,7 +11,7 @@ class MiceMaze:
     def __init__(self, maze_file):
         self.map = maze.Map(maze_file)
         self.audio = True
-        self.cell_size = 40
+        self.cell_size = 20
         self.engine = engine.GameWindow(self.map.width, self.map.height, self.cell_size, "Mice!", key_callback=self.key_pressed)
         self.graphics_load()
         self.units = {}