Classic Clash I is a microgame in the Sci-Fi folder in WarioWare, Inc.: Mega Microgame$!.
Gameplay
There is a field with a man in it (bearing a close resemblance to Mario) on the left, and a large turtle (which looks very similar to Bowser) on the right. "Bowser" will either kick rocks or spit flames at "Mario". The players must use the "A" button to jump over the rocks, and the Control Pad to duck under the flames. On level one, the players must dodge one attack. On level two, they must dodge two, and on level three, they must dodge three.