Step 3Disassemble the Cartridge
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Use your Screwfinder 9000 (eyeball) to locate the five (or three) tiny flathead screws on the back of the cartridge. Remove these and set them aside in a safe place. Luckily, one of them is now a spare, so don't kill your goldfish in frustration if you drop it in the grass. For the cartridges that have three screws, such as Mario Bros., there are two tabs at the top of the game that line up. No biggy, you can figure it out.
Open the cartridge and remove the electronic(s). Make a note of which way it's facing. You'll have to put it back the same or it won't shut. Well... I don't really know if it won't shut, because I never tried it. Just do it right.