Heres a glitch on FIVE for Xbox 360. Heres a text tutorial:
1. Make sure you have at least 1250 points and ammo.
2. Go to the middle level with the orange floor and buy the barrier in the back.
3. Go up to the rail in the middle of the computers and dolphin-dive onto it.
4. Once you get up, dolphin-dive another time until you are a bit higher.
5. Then walk wherever you want!
TIP: Don't walk near the stairs that are near the first elevator because they can hit you!