TimeShift - Platform: Playstation 3

Play as Dr. Aiden Krone:
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Enter the options menu, select "Multiplayer", "Model", then press Left to 
highlight Dr. Aiden Krone. Press Triangle, then enter "RXYMCPENCJ" as a code to 
unlock the Dr. Aiden Krone skin in Multiplayer mode.

Low gravity, jump higher, and run faster:
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While playing in Single Player mode, select "System Link" at the main menu, then 
"Host" a game. Select any game type. Set the gravity to "Very Low", jumping to 
"Very High", and movement to "Very Fast". Host the game, and it will fail. 
Return to the main menu, then select Single Player mode. The settings from 
system link will continue into your single player game.

Defeating the final Boss:
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In the battle with Dr. Krone's gigantic Sentinel, when you destroy one of his 
guns with the Pulse Gun, Krone will send artillery raining on your roof. In 
order to escape this barrage, slow time, and go into the far right corner. Face 
the wall and look up at Krone's Sentinel. Jump up on the platform. Keep running 
to the right into the corner. You will take no damage while in that corner. This 
works for all three barrages.