Retro Mini-Games
While playing the game, equip yourself with the temporal uplink and then press B. Doing this will bring up a menu where you can play some retro games. The two I have are Anaconda (like the Snake game on celphones) and an Asteroids type game. You unlock the games by locating hidden cartrdiges throughout the game.
Unlock Cardboard Characters
Beat the game on Easy difficulty to unlock cardboard characters.
Unlock Streets Arcade Level
Beat the game on Easy to unlock the Streets arcade level.
Unlock Characters in Arcade Mode
Earn a Gold medal in "Adios Amigos" (Arcade Mode) and unlock playable characters Hector Babasco and Lean Molly.
Unlock Rotating Heads Cheat
Beat "Pane in the Neck" in Silver (Challenge Mode) to open up Rotating Heads cheat.
Unlock Characters in Story Mode
Beat the level and unlock these secret playable characters:
Medium level difficulty
2280 Return to Planet X: Ozor Mox
2019 NeoTokyo: Sadako
1853 Wild West: The Colonel
1972 Atom Smasher: Khallos
1920 Aztec Ruins: Stone Golem
1990 Siberia: Hybrid Mutant
1938 Chicago: Big Tony
???? Notre Dame: Jacque de la Morte
2280 Return to Planet X: Ozor Mox
2019 NeoTokyo: Sadako
???? Robot Factory: Machinist
???? TimePortal Station(?)
