Snafuman telling the truth. Max ammo with napalm does not want to unlock. Writes to upgrade to 9, but does not say what. writes that it is currently in one. I have big explosions on 9.
PS:I apologize for the errors. I do not say or write in English. This is the text translated by google.
 "Strike Force Heroes 2"){kind=icon}
 "Boxhead: The Nightmare"){kind=icon}