Demon hidden vehicle: Press Up, Down, L1, L2,
Select, Start at the select game screen (main menu).
A sound effect will confirm correct code entry. The hidden vehicle
will be available in all game modes.
All arenas and tracks: Press Down, Up, R2, R1,
Start, Select at the select game screen (main menu).
A sound effect will confirm correct code entry. All the arenas
and tracks will be unlocked in time trial and battle mode games.
