Mario Clash

Mario Clash is a game for the Virtual Boy. The game is a return to the style of the original Mario Bros.. To progress through the game, Mario must knock enemies off platforms using Koopa Shells. There are always two Koopas; if one gets knocked off, another one takes its place. Many enemies need to be hit from the side, thus Mario must throw Koopa shells from the background to the foreground and vice-versa in order to knock them off.

Trivia
Mario Clash appeared as one of 9-Volt's microgames in WarioWare, Inc.: Mega Microgame$!.