The Clash House Tower has been invaded by bad guys! It's up to Mario to clear them out, throwing Koopa Shells to knock them away. In this 3-D update of the original Mario Bros. arcade game, Mario can stomp on a Koopa, pick it up and throw it across the room into other enemies. Though the levels are quite reminiscent of the Mario Bros. game, each level has a different design from the last, which provides more gameplay variation and requires more strategic thinking.