Pause the game and on the pause menu screen, press select on Resume and then press start. All attacks goes right through you.
Contributed By: Soletaker.
Choose "New Game" from the main menu and enter the following names for the desired effects
Password Effect SAMIAM Enemies Dont Attack You SAMIBE Start with 99 Lives SAMIWAS Unlock All Missions
Contributed By: GameMasterZer0.
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