Select the "Extras" option at the main menu. Select "Cheats", then enter one of the following codes:

Code: Result:- Right, Right, Left, Down, Up, Up, Up, Down Unlock Alex Mercer's devastating body surfing ability

Prototype Unlockables

Complete each condition to get the allotted Trophies.

Au (Silver): Achieve a rating of gold or better in all events.
Brain Trust (Bronze): Complete all consume events.
Cleanup (Bronze): Kill 15 characters with a single whipfist attack.
Endless Hunger (Silver): Consume 200 characters to boost your health.
Evolutionary step (Bronze): Use the upgrade menu to acquire an upgrade.
Gunning (Bronze): Destroy 20 helicopters in a single helicopter flight.
Half-Truths (Bronze): Complete a mission without causing a single military alert.
Hard To Kill (Gold): Complete story mode in any difficulty without dying.
In Plain Sight (Bronze): Evade 10 strike teams.
In The Web (Bronze): Consume 50 web targets.
Infiltrator (Bronze): Infiltrate 10 military bases disguised as a commander.
It’s Him! (Bronze): Patsy 5 military personnel.
Mankind is your mask (Silver): Complete 3 missions without causing a single military alert.
Misconception (Bronze): Destroy 25 infected water towers before they hatch.
Nice Guy (Silver): Complete the game while consuming 10 civilians or fewer.
Platinum Trophy: Collect all other trophies.
Polymath (Silver): Collect all hint collectibles scattered across New York City.
Pt (Gold): Achieve a platinum medal in all events.
Repossession (Bronze): Seize 50 vehicles from enemy hands.
Return Fire (Bronze): Catch any object tossed by a hydra; and throw it back.
Revenge Revisited (Gold): Complete story mode on hard difficulty.
Self-Deception (Bronze): Discover what happened to Alex Mercer through the web of intrigue.
SME (Bronze): Gain the ability to drive and fly all vehicles.
Speed Bumps (Bronze): Run over 500 characters in a single tank.
Streetwise (Silver): Collect all landmark collectibles scattered across New York City.
Surface-To-Air (Bronze): Shoot down 50 helicopters while driving armor.
The Butcher (Silver): Kill 50 characters in 5 seconds.
The Cleaner (Silver): Destroy 10 military bases or infected hives in New York City.
The First Thread (Bronze): Unlock the web of intrigue.
Threat Elevated (Bronze): Destroy 25 strike teams.
Trail Of Corpses (Silver): Kill 53,596 infected.
Unnatural Selection (Silver): Acquire all available upgrades.
Web Of Knowledge (Gold): Acquire all nodes of the web of intrigue.
Wrecking Yard (Bronze): Destroy 2,000 Vehicles.