The Mystery Zone glitch is a glitch in Brawl that takes place during the Home-Run Contest. Normally, knocking the Sandbag to the left of the platform would result in zero distance and end the game. However, using a second player, Sandbag can be hit out into the field before being whacked far left with the Home-Run Bat. Performing this glitch will allow the Sandbag to travel left and see what the stadium looks like left of the platform.