Run the game, then hit the left button on the back of your Action Replay (or similar) cartridge and press E before entering the following codes:
POKE 4388,165 (infinite lives)
POKE 3358,165 (infinite ammo)
POKE 4465,165 (Twang)
Once you're done, press F3 (or enter SYS2825 if yours is not an AR cart) to restart the game with cheats intact.
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