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When you want to enter in one of the following PS2 cheat codes, you need to hit "Start" while you're picking out your mission. Then, go down to "Extras" and hit "Enter Secret Code". This will them prompt you to enter in the following codes in the form of different combinations of Ben 10 aliens:
To get the Dark Heroes, you need to enter in this combination of Ben 10 aliens: Cannonbolt twice, then 4arms, and last Heatblast.
To get the DNA Force, enter in this combination of Ben 10 aliens: WIldvine, 4arms, then Heatblast and finally Cannonbolt.
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To get invincibility (which is a great perk!), enter in this combination of Ben 10 aliens: XLR8, then Heatblast, then Wildvine, and finally 4arms.
To get master control, enter in this combo: Cannonbolt, then Heatblast, then Wildvine, and finally 4arms.
To be able to unlock all of the Ben 10 alien forms for your toon, put in this alien combo: Wildvine, 4arms, then Heatblast and finally Wildvine again.
To get all of the combos unlocked, you need to enter in this Ben 10 alien combination: Cannonbolt, Heatblast, then 4arms, and finally Heatblast again.
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Want all of the locations on the map opened up to you? Enter in this Ben 10 alien combo: Heatblast, XLR8 twice, then finally Cannonbolt.
To get costumes for your Ben 10 alien toons, enter in this PS2 cheat codes: Wildvine, 4arms, then Heatblast and finally Cannonbolt. When you get done, head back to the "Secrets" menu to activate it and you'll get different costumes, such as Gwen.
