You can define your own number of blocks in six steps from 4x4 to 20x20, shown in 3D fashion.

Click on any pair to make them change places; once a piece is properly positioned, it cannot be moved.

Nice-quality Midi background music and sound effects, both optional, accompany your play.

Appearance great at 256 colors but best results will be at higher color depths and resolutions.

Other options include a timer display, number of moves, a statistics file, and more.