In a one player game, press Select and then press L, Right, B, L, R and Left at the game menu screen. Then enter the password for the desired effect:
Effect Password 200 Health Code HEA All Ammo AMMO All Keys KEY Display Programmers Coordinates on screen COOR Freeze Enemies FRE Getting All Weapons WEAP Invincibility GOD Max Armor ARM Radar Mode MON
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