Steps and instructions :
You can redeem prepaid codes by going to Xbox.com or by using your Xbox 360 console.
To redeem prepaid codes by going to Xbox.com
Action GamesMarketplace item: The item is purchased and will be downloaded automatically the next time your console connects to Xbox LIVE.
Call of Duty: Black Ops
Fist of the North Star: Ken's Rage
Mortal Kombat: HD Arcade Kollection
Tom Clancy's Ghost Recon: Future Soldier
James Bond 007: Blood Stone
Call of Duty: The War Collection
Enslaved: Odyssey to the West
Naughty Bear
Doom II
AQUA - Naval Warfare
Red Dead Redemption
Prince of Persia: The Forgotten Sands
Rocket Knight
Things On Wheels
Lost Planet 2
Raystorm HD
Serious Sam HD: The Second Encounter
Dead to Rights: Retribution
Iron Man 2: The Video Game
Saw 2
Final Fight: Double Impact
Rage
Lead and Gold - Gangs of the Wild West
Kane & Lynch 2: Dog Days
Blacklight: Tango Down
Sports Games:
Blood Drive
Pro Evolution Soccer 2011
John Daly's ProStroke Golf
H.A.W.X. 2
Monster Jam: Path of Destruction
Battle vs. Chess
NBA Jam
EA Sports Active 2.0
Football Manager 2011
Adventure:
Assassin's Creed: Brotherhood
Need For Speed: Hot Pursuit
Final Fantasy XIV
Gears of War 3
Batman: Arkham City
Gran Turismo 5
Dead Space 2
Infamous 2
Killzone 3
Resistance 3
Dragon Age 2
Toy Story 3
NIER
Power Gig: Rise of the SixString
Chime
Prison Break: The Conspiracy
Project Mercury