Sega's SegaCD and 32X

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Doom (32X)

Degreelessness Mode:

At any time during gameplay, press (PAUSE+X+Z+MODE+U) for invinciblity. [Code requires a 6-button controller.]

Happy Ammo Code:

While the game is paused, press U, A, C, and MODE for access to all of the weapons and full ammo. [Code requires a 6-button controller.]