Pause the game and go to options and then the cheats menu. Then you need to enter the codes below (case sensitive) to activate the cheat.

Invincibility - Enter "everythingproof" as a password.

Infinite Ben10 Alien's energy - Enter "generator" as a password.

Full upgrades - Enter "herotime" as a password.

All ten aliens after Ben loses all aliens - Enter "primus" as a password.

Advance to next level cutscene - Enter "portal" as a password.

Big Smoothy - Enter "xlsmoothy" as a password.

Toggle HUD health and energy display - Enter "hud" as a password.