Eve of Extinction Cheats

Unlock Bonus weapon : Double Dagger,
After finishing the game under any degree of difficulty. Save game after the completion of credits. Reload the game you have just saved and start with a double dagger (you also will have your original 2 weapons as well)

Unlock Survival and 3-Minute Attack modes,
After finishing the game under any degree of difficulty you will unlock the "Survival" and "3 Minute Attack" modes

Boss battle mode:
Play the Wisdom Headquarters level and proceed through until you have activated the main elevator. Enter the library on the unrestricted side and go upstairs. The door at the top should now be open. Go upstairs and exit out onto the balcony. Jump onto the chandelier, then go on the other balcony., Enter the room on the other side and defeat both enemies. Get the piece of paper and you will unlock the Boss battle mode option.
User Cheat by FilmJunkie

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