Puzzle game with Mario and the goal is to use your hammer to run around and smash all the walls on each level. Some things you destroy can have side effects so you need to find the correct order to destroy everything in. Can be played in co-op multi player also and as always it is more fun. As most games like this it grows tiresome fast as most of the 100 levels are to much alike and you end up running around trying to punch down the other player :)