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
Effect Password Enemies Dont Attack You SAMIAM Start with 99 Lives SAMIBE Unlock All Missions SAMIWAS
Contributed By: GameMasterZer0.
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