Transformers: The Game

For unlimited health, pause the game during gameplay and insert the following password: Square, Triangle, Left Trigger, Right Trigger, Up, Down, Left, Right.

Play the Water Treatment Plant mission. Go into the building. Go up the first ramp then go left. There will be a big window. Shoot it and when you get out there will be a bridge. Jump off the right side of the bridge. You will be walking on air.

Successfully complete the game to unlock the following Autobots and Decepticons:

Autobots
Bumblebee
Hoist
Hound
Ironhide
Jazz
Optimus Prime
Ratchet
Sideswipe
Trailbreaker
Wheeljack

Decepticons
Barricade
Blackout
Bonecrusher
Brawl
Megatron
Mixmaster
Shockwave
Starscream
Swindle
Thundercracker

Decepticon Drones
Dreadwing
Dropkick
Longarm