At the New Game/Continue screen enter the following codes:
Effect Code Four screen mode Up, Right, Down, Left, Run Level Select Up, Left, Down, Right, Run Perform Killer Punch Anytime Up, Up, Down, Down, Right, Left, Right, Left, Run Sound test II, Select, Up, Run Special Mode Up, Down, Left, Right, 2, 2, 2, Run. View ending Up, Up, Down, Down, Left, Right, Left, Run
Reach the last boss (Mr. X) and let him defeat you until you have 3 continues left. On the "New Game/Continue" screen, hold Run and press Select to reset the game. If done right, you'll be right back at the Continue screen and it will say "Level 2" on top, which means the game will be in hard mode.
Contributed By: ReyVGM.
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