Ben 10: Alien Force

Cheat mode

At the "Bonus Content" menu, select the "Enter Code" option. Enter one of the following codes at the "Secret Cheat" screen to unlock the corresponding cheat option. Then, enable the unlocked cheat at the "Secrets" menu.
Invincibility

Enter Kevin, Big Chill, Swampfire, Kevin as a code.
Infinite Aliens

Enter Ben, Swampfire, Gwen, Big Chill as a code.
All combos

Enter Swampfire, Gwen, Kevin, Ben as a code to unlock all combos.
Level Lord

Enter Gwen, Kevin, Big Chill, Gwen as a code.
Goop

Enter Ben, Swampfire, Kevin, Big Chill as a code