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 27868,173 (unlimited credits)
POKE 27686,173 (extra credits)
POKE 8141,165 (infinite tile drops)
Once you're done, press F3 (or enter SYS 2079 if you do not have an Action Replay) to restart the game with cheats intact.
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