When  selecting  a mission, press Start, select Extras then enter
one of the following codes:

Unlock Dark Heroes:
     Enter cannonbolt, cannonbolt, 4arms, heatblast as a code.

Unlock DNA Force:
     Enter wildvine, fourarms, heatblast, cannonbolt as a code.

Unlock Invincibility:
     Enter XLR8, heatblast, wildvine, 4arms as a code.

Unlock Master Control:
     Enter cannonbolt, heatblast, wildvine, 4arms as a code.

Unlock Alien forms:
     Enter wildvine, 4arms, heatblast, wildvine as a code.

Unlock all combos:
     Enter cannonbolt, heatblast, 4arms, heatblast as a code.

Unlock all map locations:
     Enter heatblast, XLR8, XLR8, cannonbolt as a code.