How to Test a Used NES Game Before You Buy

Quick answer

Before buying a used NES game, visually inspect the cartridge label and pins, check for authenticity marks, and test it in a known-working console. Clean the pins with isopropyl alcohol if needed, and verify the save battery works if the game uses one.

Why Testing a Used NES Game Matters

NES cartridges are over 30 years old, and their edge connectors can corrode or bend. A game that looks clean on the outside might still fail to boot due to dirty or damaged pins. Taking a few minutes to inspect and test a cartridge before you hand over cash saves you from buying a non-working game.

Even if a seller claims the game is tested, a quick visual check gives you confidence. Look for signs of rust, bent pins, or a faded label that might indicate a reproduction shell. Authentic NES cartridges have specific mold marks and label quality that fakes often miss.

What to Look For on the Cartridge Label and Shell

The label on an authentic NES game is sharp, with crisp text and a matte finish. Reproductions often use glossy paper or have blurry text. Check the rear of the cartridge for the Nintendo 'seal of quality' and the correct product code. For example, the original Super Mario Bros cartridge has a distinct red label and a specific UPC (045496734060) that you can verify online.

Also inspect the plastic shell for cracks, warping, or mismatched colors. Authentic NES carts are made from a consistent gray plastic. A shell that feels lighter or has rough edges may be a third-party reproduction.

Inspecting the Cartridge Pins

Open the cartridge (if possible) or look through the slot at the bottom to see the edge connector pins. They should be straight, evenly spaced, and free of green or white corrosion. Bent pins can often be straightened with a plastic tool, but broken pins mean the game is likely dead. Dark or tarnished pins can usually be cleaned, but heavy corrosion may have damaged the internal traces.

If you can't open the cart, insert it into a console and gently wiggle it. A game that only works when pushed to one side likely has dirty or bent pins. This is a common issue with NES games due to the front-loading design.

Testing the Game in a Console

The most reliable test is to play the game in a known-working NES console. Insert the cartridge, press it down, and power on. If the screen stays gray or shows a blinking red light, the pins likely need cleaning. If the game boots but has graphical glitches or freezes, the cartridge may have a damaged chip or dirty pins.

For games with save batteries, like RPGs or sports titles, start a new game and save. Then power off, wait a few seconds, and power back on to see if the save persists. A dead battery can be replaced, but that adds time and cost. For example, a used copy of Super Mario Bros doesn't have a save battery, but many other NES games do.

Cleaning the Pins Safely

If the game doesn't boot or has intermittent issues, clean the edge connector pins. Use a cotton swab lightly moistened with 91% or higher isopropyl alcohol. Rub the pins gently, then let the alcohol evaporate completely before testing again. Do not use water, abrasive cleaners, or metal tools that can scratch the contacts.

For stubborn grime, you can use a pink eraser on the pins, but be very gentle to avoid removing the gold plating. After erasing, wipe with alcohol to remove any residue. This method works well for games that have been stored in dusty attics or basements.

Step-by-step NES game testing checklist

1. Inspect the label and shell: Check for sharp print, matte finish, and correct product code. Look for cracks or mismatched plastic. Common mistake: assuming a glossy label is authentic. Repros often use shiny paper.
2. Examine the edge connector pins: Look for straight, clean pins without corrosion or breaks. Dark pins can be cleaned; green corrosion may be fatal. Checkpoint: bent pins can sometimes be fixed, but broken pins mean the game is likely dead.
3. Test in a working NES console: Insert the cartridge, press down, and power on. Watch for gray screen, blinking light, or graphical glitches. Common mistake: assuming a game is dead if it doesn't boot on first try. Dirty pins are the usual culprit.
4. Verify save battery function (if applicable): Start a new game, save, power off, then power back on to check if the save persists. Checkpoint: dead batteries can be replaced, but factor in the extra cost and soldering skill.
5. Clean pins with isopropyl alcohol: Use a cotton swab with 91% alcohol to gently rub the pins. Let dry completely before testing. Common mistake: using water or abrasive tools that can damage the contacts.

Product facts

• Super Mario Bros – NES Game: Super Mario Bros – NES Game cartridge. Original, tested, and ready to ship. Game is fully tested & working. Disc only unless otherwise specified. UPC:045496734060. This is a classic example of a tested, authentic NES game. Its clean label and verified UPC make it a safe buy for collectors who want a guaranteed-working copy.