the answer is there are no cheats only secrets (that aren't really that secret anyway)
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you have to get an upgrade from the gene blender in your saucer.
Destroy all humans path of the Furon won't be coming out on PS2 as there is too much content in the game for a PS2 disc to hold. It is only on PS3 and XBOX360 in Europe and only on XBOX360 in the USA.
60$ for ps3 and XBOX 360 and 50$ for wii and ps2
Theirs 1 game of Destroy All Humans.Destroy All Humans! Path of the Furon(Xbox 360 and PS3 in Europe, but in USA only on Xbox 360). Theirs about 4 games in the destroy all humans series. First two in PS2 and Xbox(original) and the third is big willy unleashed on the WII and the final path of the furon and on consoles on top this answer.
there is cheats but they don't work