This is a classic sliding block puzzle game, the rules is very simple, just try your best to move the largest block out with a minimum number of moves.
1) You can play this game from easy to difficult by selecting 'Step by step' in Menu dialog, which is recommended for beginner.
You also can select your favorite puzzle on Menu dialog.
2) Sound: You can turn it on/off.
3) Score: your moves can be recorded automatically.