- Silverbolt
Enter '10141' as a code to unlock Silverbolt in Multiplayer mode.

- Kup sequence
After the tutorial cutscene has finished, enter the first room. Talk to Ratchet and Air Raid, then turn right. Locate the three computer monitors along the wall. Walk up to the middle monitor that is under the spotlight. You will now have a conversation with a person named Kup.

- Arena characters
Overcome the indicated Boss as an Autobot (to unlock an Autobot Boss) or a Decepticon (to unlock a Decepticon Boss) in the Arena to unlock them as a playable character:

Jazz (Autobot)	Overcome him in Stadium stage #6 (Arena stage #6).
Grimlock (Autobot)	Overcome him in Purification stage #6 (Arena stage #30).
Barricade (Decepticon)	Overcome him in Stadium stage #6 (Arena stage #6).
Cyclonus (Decepticon)	Overcome him in Streets stage #6 (Arena stage #18).
Shockwave (Decepticon)	Overcome him in Purification stage #6 (Arena stage #30).
Motormaster (Decepticon)	Overcome him in Sewers stage #6 (Arena stage #12).
Hot Rod (Autobot)	Overcome him in Dam stage #6 (Arena stage #24).
Air Raid (Autobot)	Overcome him in Streets stage #6 (Arena stage #18).
Breakdown (Decepticon)	Overcome him in Dam stage #6 (Arena stage #24).
Ultra Magnus (Autobot)	Overcome him in Sewers stage #6 (Arena stage #12).

- Ramjet
Enter '99871' as a code to unlock Ramjet in Campaign and Multiplayer modes.