- Play against the computer or a friend.
- Five difficulty levels for the computer opponent: from novice to expert.
- Unlimited undo of your moves.
- Highlighting of legal moves (optional)
- Highlighting of the last piece placed (optional).
- Move suggestions.
- Automatic saving of the current game when you quit.
- Fixed drawing problems when running on OS X 10.8.
- Mac OS X 10.5 or later