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Blue and green disagree, only one way to solve this problem. Dropping rocks on each other's heads. The first person to drop a rock on the other's head three times wins the game.  

Only one controller is required to play.

UPDATE : The first player will be the green player on the left and presses either the buttons or the arrows the other player will be the blue player.

This game is very freely inspired (copied) on Dong dong a two-player mini game present on WarioWare Inc on GBA. Thanks to them.