If your game freezes, you can force quit the application by following these steps:

  1. Go to Settings > Apps
  2. Go to the Downloaded tab, pick the game you want to quit, and tap Force stop.

Please note that these are general instructions that should work for most Android devices. However, your device's interface may differ slightly depending on which Android version your device is running on, so these instructions may not match the exact headings on your device.