Most emulators support Game Genie codes. For use with NESticle, open a ROM, press F6, type in the code, then click on "ADD". The code should appear in the bottom of the window. To turn it on, double-click it so it's flashing, or highlight it and click "TOGGLE". With certain codes, you may have to reset the ROM to see the effect(s).

• Super Mario All-Stars
• Super Mario Bros.
• Super Mario Bros. 2
• Super Mario Bros. 3
• Super Mario Kart
• Super Mario World