One Disc Multiplayer:
(1) Have a host create a game, do the settings and all that and start the game
(2) Eject the UMD and pass it off to another player
(3) He then loads up the game on his PSP and joins the game
(4) Redo for every match you want to play. So set the frag limit high to keep playing
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Unlockables:
| Beat Stage 2 | Super Deformed Mode |
| Beat Stage 4 | Infinite Ammo |
| Beat Stage 5 | Infinite Adrenaline |
| Beat Stage 6 | Incredible Fit Dog |
| Beat game in Normal | Normal Challenge and Hard Modes |
| Beat Villa mission | All weapons |
| Beat Train Yards mission | Infinite Ammo |
| Beat Rooftops mission | Invincible |
| Beat Under Rink mission | Incredibly Fit Dog |
| Beat Back Streets mission | Infinite Adrenaline |
| Beat Pink Starfish mission | Super Deformed Mode |
| Beat Old Church mission | Flame Fists |
| Beat Dockyards mission | Cabal Skin |
