Find them.
By earning all the skill points, the more skill points you have the more cheats you unlock.
You have to do the skill points
In the later planets, you can shoot the things flying in the sky.
You need 20 skill points. there isn't a special code
Go to the Start menu, Extras, and Skill Points. You're actually able to check your skill points even in regular mode.
Snipe 10 Tyhrranoids in towers on planet Tyhrranosis. it's as simple as that
infect enimies with infector
Skill points let you activate certain easter-eggs and cheats in the game. You can access the skill point menu from the pause menu. The more skill points you get, the more stuff you can do.
skill points are used to unlock costume like turning in to a snow man and turning into a cragmite that's all i can remember :). also you can get a tresure map(which shows where the skill points are) when you defeat captain slag
The more skill points you have, the more cheats you unlock.
No. You will need the Action Replay Max. You should get many skill points to activate cheats in the Special menu.
you can't see them you have to use cheats to help you