Play the world's most popular logic and reasoning puzzle. It's fun, challenging and addictive.
Four different playing levels (easy, medium, hard, expert). You can customise the appearance of your software with different graphics settings. On-screen pencil mark view allows you to see your calculations. An automatic save function allows you to exit and resume game at a later date. There is a unique puzzle generated with every new game. There are an unlimited number of puzzles to play.