Complete Story Mode on the Hard difficulty setting to unlock infinite
ammunition in all game modes.
Beat the Mafia Mission on normal to unlock the master. . .
Unlock arcade level called Streets:
To unock the arcade level ”Streets”, just beat the game on easy difficulty.
Unlock Cardboard Characters:
Beat the game on easy to obtain the Cardboard Characters cheat.
Unlock Characters In Arcade Mode:
Earn a Gold medal in Adios Amigos (Arcade) to unlock Hector Babasco
and Lean Molly.
Unlock Rotating Heads Cheat:
To unlock the rotating heads cheat, just beat Pane in the Neck in
Silver (Challenge mode).
Unlock Some Silly Hats:
Viking Hat – Beat ”Silent But Deadly” with a Gold or Silver medal
Pirate Hat – Beat ”Trouble At The Docks” with a Gold or Silver medal.
Big Ears – Beat ”Escape from Neotokyo” with a Gold or Silver medal.
Unlock the Site Multiplayer Level:
I noticed the level unlock code someone submitted didn’t list The Site.
To unlock The Site level, complete Story mode on Hard.
View the Ending Movie:
Successfully complete the Space Station on Easy mode to view the ending movie.