So basically it requires memory of the real path and strategy to walk all the tiles once. And the most difficult thing is the last tile must be the door so that you can enter next level. It is fun and challenging to someone likes me with low brain XD. I would say the winning method is not stated clearly at first. It only tells us not to step on the same tile twice, and we need to go to the door to escape, while it didn't tell us to walk through "all the tiles" in order to open the door. I think it is a little bit confusing and I try a few times at the first level in order to figure out this rule. Other things are great including the visual and audio.