LEVEL TWO: Progress thru the warehouse beating up every minion you come across. With the forklift, jump behind it and keep webbing it. Doctor Octopus: walk up and keep punching and hitting!
LEVEL THREE: The Lizard's key is hidden in a pit to the far right of the playing area.
LEVEL FOUR: Flick the levers to stop the many electrical charges. Quickly progress to the next lever, or the charges will begin again. After beating Electro, you can get his key by webbing your way up thru the generator poles, instead of dodging around.
LEVEL FIVE: To defeat Sandman, stay near one of the fire hydrants and wait for him to approach.