The following cheats are available for the computer game Prototype on PC.
Unlock Body Surf Ability
Cheat code: Right, Right, Left, Down, Up, Up, Up, Down
Unlock Hard Mode
Complete the game on Normal to unlock hard mode.
New Game + Mode
Simply complete the game on Easy or Normal to unlock the New Game + Mode. In this mode Alex' skills are unlocked from the beginning. If you beat the game on Easy you will unlock Easy + Mode, if you beat it on Normal you will unlock Normal + Mode and Easy + Mode (if you skipped easy completely).