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Hold L and press B, A, X, Y during game play to advance to the next checkpoint. A sound will confirm correct code entry.
Hold L and press X, Y, B, A during game play. A sound will confirm correct code entry. Note: The code cannot be enabled until you take the elevator after being attacked at the start of the game. When a new area is loaded, the code must be re-entered to regain its effect.
The following codes are for Ultimate DOOM and DOOM II included in the Collector's Edition. Enter any of the following codes during gameplay and while Holding Left Trigger. Enter them in again to turn them OFF: