Colt Python Finish the game in the advanced mode.
Double Ammo Select New Game, hold > at Advanced until it turns green.  You will receive double ammo and ribbons. (Thanks to MxAxD@aol.com)
Infinite Rocket Launcher Beat the game in under three hours, save it, and load the game you just saved. (Thanks to VicFan123@aol.com and others)
Remove Emblem Examine the Doom books and turn them on the side with the pages facing you and press X to open them.

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