Secret - Cool Items, Ferocious Beasts and some Easter Eggs.
Chi - Spawns a friendly chinese dragon.
Cthuhul - Spawns a cool beast.
Developers - Type a name of a 5th Cell developer to spawn them. (You don't need o type the full name of any of them except "Matt Cox".
Freeze Ray - Spawns a gun that temporarily freezes the target.
Kraken - Spawns a killer squid. (You may also type "Giant Squid")
Liz - Spawns a Robot Woman that can turn humans into other Liz. It is afraid of its own kind.
Lol Wut - Spawns a giant Maxwell head.
Lunar Lander - Spawns a Lunar Lander that can fly.
Lunar Rover - Spawns a Lunar Rover that can fly.
Shrink Ray - Spawns a gun that shrinks the target to ease defeating it.
Teleporter - Teleports you to a random area.
Time Machine - Takes you to ancient times.
Vending Machine Glitch - In action levels where you have to get the Starite, attach HANDCUFFS to the Starite and a VENDING MACHINE. Suddenly, you'll get an option to Fill, click it and you can drag the Starite in the Vending Machine anywhere around the map.