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Play at Hard Difficulty
Up, Select, L1, R2, Square, Circle, X at the same time, then highlight "One Player" and press Up, Select, L1, R2, Squa

Secret Level and End Level cheats
Complete ''One Player'' mode on normal difficulty (no inputting ''Hard Difficulty'' cheat code) to unlock Select Level and End Level cheats in the ''Cheats'' menu.

Super Agent Mode
Complete all of the mini-games on all difficulties in ''Mini Game'' mode to unlock the Super Agent cheat in the ''Cheats'' menu.

Biathlon
Instead of using a taser. Try taking out the leaders in the building and most of the thugs by using less than 22 shots from your sniper rifle. Gabe will say ''got it'' which activates biathalon.

Colorado Bridge Arena
Play through Pugari Complex while refraining from killing Foreman Jones. Lawrence will not say ''got it'' at the end of the mission.

Rhoemer's Computer Center Arena
Play through C-5 Galaxy Transport without killing the co-pilot. Gabe will say ''Got it'' at the end of the mission.