Press one of the following codes at the "New Game" screen.

Note: Enabling the following codes will lock all extra content and block you from Xbox Live game scores.

Code - Effect

Ammo no reloaded
Up, Down, Left, Right, Up, Up, Down

Bonus Cybertron missions
Right, Up, Up, Down, Right, Left, Left

No traffic, police, or military
Right, Left, Right, Left, Right, Left, Right

Play as Jazz Generation 1 version
Left, Up, Up, Down, Left, Up, Right

Play as Optimus Prime Generation 1 version
Up, Up, Down, Down, Right, Right, Right

Play as Starscream Generation 1 version
Right, Down, Left, Left, Down, Up, Up

Unlimited health
Press Left, Left, Up, Left, Right, Down, Right at the menu with the "Campaign", "Bonus", and "Options" selections.

Unlock All Missions
Go to "Campaign -> Bonus Features -> Credits menu" and enter Down, Up, Left, Right, Right, Right, Up, Down.

Unlock Megatron G1 Version
Press Down, Left, Left, Down, Right, Right, Up at the menu with the "Campaign", "Bonus", and "Options" selections.

Unlock Robovision Optimus Prime
Down, Down, Up, Up, Right, Right, Right.