Red Shell glitch

The Red Shell glitch is a glitch that originated in Super Smash Bros. To activate this glitch, the player must have multiple Red Shells in the same spot, making the only place to practically use the glitch training mode. In training mode, choose Mario and drop as many Red Shells as possible in a single spot. Then, use Mario Tornado while standing in them. The result should be a black hole-like effect that can deal up to 999% damage easily.