Mystery zone glitch
The mystery zone glitch is a glitch in Super Smash Bros. Brawl that can be performed in 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.
As the camera pans left, the blank terrain can be seen. There are no tiles or distance markers on the ground, probably because nothing was intended to be in this area. Surprisingly, there is a wall about 200 feet (66.7 meters) to the left that Sandbag will hit and bounce off of, and even makes a sound. (This sound is the same sound effect heard when Sandbag hits the normally used force field.) It is possible to go over this wall if Sandbag is flying high enough. The Stadium and ground ends at about -200 feet (-66.7 meters), and after that only the sky background will be shown. Since there won't be any ground, Sandbag will not be able to land. At -1200 feet (-400 meters), the sky will end and Sandbag will be flying through nothingness.
Note: Snake is hacked to be giant size to make the glitch easier to perform.