From the Super Mario Wiki
Apple Assault is a souvenir found in the Games folder of WarioWare: Twisted! based on the Wee Wario Blast microgame. In this souvenir, a cannon will fire an infinite number of Tiny Warios at incoming enemies, which have a human-like appearance, except for their apple head. These enemies are defeated by having at least two Warios grab on to them. When a bomb is caught by the Tiny Warios, an explosion will cause nearby enemies to rot and retreat. The game ends when an enemy gets too close to the cannon, which will give the enemy the chance to throw a match at the cannon, causing it to explode.