Black BFG in first level: Enter 5SQQ-5THA-ZFFV-7XEV as your profile name. Include the dashes. If entered correctly you should be able to enter a new profile name. You'll start the first level with the BFG. Silver Weapons: Beat the game on normal or hard difficulty. All guns for that difficulty and below will be silver and have unlimted ammunition. Black Ops difficulty: Beat the game on hard difficulty. Extra Weapon: Beat the game on Black Ops difficulty to unlock the M16A2 on any difficulty setting. It's an M16 with a grenade launcher attachment.