This game of Japanese origin should be well-known by now. The purpose is simply to push all boxes to the designated targets. The implementation uses the original ingenious 50 levels.

You can use the following keys.

arrow keys

to move the pusher

esc

to retry the level

backspace

to undo the last push

F1

to jump to another level

There is a cheat code for levels. It is 1779*7^n modulo 2993.

You can download the complete source.