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 7427,173 (infinite lives)
POKE 5650,173 (infinite grenades)
POKE 7651,173 (infinite ammo)
Once you're done, press F3 (or enter SYS2061 if yours is not an AR cart) to restart the game with cheats intact.
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