Bob-omb Blast

From the Super Mario Wiki

Bob-omb Blast is a Battle Mode in Mario Kart: Double Dash!!. To succeed, the player must collect Bob-ombs and throw them at other players. If the player is successful, he gets one point, but if he is hit by another player, he will lose a point. When someone gets three points (two karts) or four points (three or four karts), he will win.