classic Sokoban game:Only one box can be pushed at a time. A box cannot be pulled. The player cannot walk through boxes or walls. The puzzle is solved when all boxes are located at storage locations. Arrow Keys to Move.Key P previous level,Key N next level. so many many levels is waiting for you,the pleasure and challenge is unlimited.there are 4667 levels so far.Now there is answer for 4100 levels in game.