Unlockable Characters and Levels
Yellow Jacket-in the Junkyard level, shoot the plane that circles the area with a Flame or a homing missile. It will start descending and crash into a building. Drive down to the wreckage and drive through the hole in the building. You will see a pillar with a control panel on it. Shoot the panel and you're done.
Axel-in the Freeway level, go down to the construction yard. You will see two cranes. One holding a crate and one holding a pipe. Aim at the control panel on the crane holding the pipe. If you do so, the crate will be lowered. Blow up the crate and you're done.
Manslaughter-in the Prison Passage level, wait until the ship is dockd. Drive down to the bottom of the boat. From the ramp, go right and go to the hull. You will see a stack of crates with a health pick-up on top. Shoot the crates and they will form a ramp. Drive up the ramp and shoot at the side of the boat.Drive into the hole and you will see a pillar with a control panel on it. Shoot the control panel and you're done.
Warthog-in the Suburbs level, go to the Ferris Wheel. Turn around until you see a small hill with a gas can power up. Aim at the pick up and drive. Jump off and you should land on top of the factories. Shoot the raised section. Drop down inside. Shoot the control panel and you're done.
Minion-complete story mode with all characters, including the ones above.
Elevators-in the Highway Loop level, go to the raised bridge and shoot the first round storage container at the chemical plant next to it. It will roll onto the road and eventually make a hole in the tunnel. Get the cube inside to unlock.
Power Plant-in the Junkyard level, shoot the pizza man. His box will form a ramp. Go up it and wait until the trash compactor is raised. Jump onto the building. Collect the cube and you're done.
Added by: DeadWing Jan 19th 2009, ID#31540