From DuncanWiki

My Thoughts

The campaign is TONS of fun, especially when you use the special weapons in concert like the sniper rifle & GPS mortar strike. Online multi-player has very limited play types, but they're more than enough to keep the game fun for hours upon hours. Definitely worth buying used.

XBox Marketplace Codes

These may or may not work, I haven't tried them yet. They look to be XBox Marketplace codes.

• BS7U-KZEQ-GJR6-EA9Y
• H74G-PLGV-NLZN-4RH3
• 2RAL-MZVT-LJHY-PQR2
• AVJ4-8MFM-C9RN-DLWK

Unlocking Weapons

Go to the UNLOCK page in the menu and input the following:

• your3mynextt4rget Unlock QBU88 Recon Kit
• try4ndrunf0rcov3r Unlock the M60 Support Kit
• cov3r1ngthecorn3r Unlock the Uzi Special Ops Kit
• aw3somef1rep0wer Unlocks USAS12 for use in multiplayer.