Reversi which you can play against the computer. Depending on the level, it will look ahead from between 11 to 17 moves from the endgame. 3 moves before endgame, it will go into complete analysis of moves. There are 5 levels available. For options, you can turn on/off background music, sound and hints. There is also an option to undo the last move. Finally, please win by taking more pieces than the computer.