How to Check Cartridge Authenticity Before You Buy

That £15 copy of Pokémon Emerald, Castlevania: Aria of Sorrow or Fire Emblem can look like a bargain until it arrives with a blurry label, the wrong board inside, or a save battery that never existed. Knowing how to check cartridge authenticity is one of the most useful skills in retro collecting, whether you are filling a childhood gap or buying sought-after Nintendo and Sega releases for a serious collection.

Counterfeit cartridges range from obvious fakes to convincing reproductions made with modern shells, newly printed labels and copied ROMs. Some are sold honestly as repro carts. Others are listed as original games, often with photographs carefully chosen to hide the giveaway details. The aim is not to become suspicious of every loose cartridge. It is to know what a genuine example should look and feel like before money changes hands.

Start with the cartridge, not the price

A very low price deserves a closer look, especially for titles with established collector demand. That does not automatically mean a game is fake. A seller may be clearing a loft, misidentify a variant, or simply want a quick sale. Equally, a high price and a polished listing do not prove authenticity.

Compare the cartridge against reliable images of the exact game, platform and regional release. PAL games can differ from North American and Japanese versions in label layout, cartridge code, rating symbols and shell shape. A genuine UK copy of a Game Boy Advance title should not be dismissed because it differs from a US image online, but its details should make sense as a PAL release.

Check that the title, publisher logo, age rating, region code and cartridge code all belong together. A PAL Nintendo 64 game, for example, should have a matching regional designation rather than a mixture of European label art and an American code. Mismatched details are often more telling than one imperfect-looking corner.

How to check cartridge authenticity from the outside

The outside inspection catches a large share of counterfeit games without opening anything. Use good daylight or a bright lamp, then inspect the label, shell, moulding and contacts closely.

Read the label like a collector

Original labels are usually sharply printed, with clean fine text and colours that match known examples. Counterfeit labels often appear slightly soft, overly saturated or too dark. Look at small lettering around copyright notices, the Nintendo Seal of Quality, barcode area and any age-rating mark. On a genuine label, these elements should remain legible rather than dissolving into dots or fuzzy lines.

The cut of the label matters as much as the print. Genuine labels are generally placed straight and cut accurately around corners and recesses. A label that is crooked, too glossy, unusually thin, or leaves an odd border may be a replacement. Be careful here: a real cartridge can have a replacement label after decades of wear. That affects collector value, but it does not necessarily make the game board fake.

For Game Boy, Game Boy Colour and Game Boy Advance cartridges, inspect the label surface at an angle. Many original labels have a particular finish and texture, while modern prints can look flat and freshly glossy. On some GBA titles, a small stamped number or code may appear on the label. Its presence alone is not proof, as fakes can copy it, but a missing or poorly formed stamp is another reason to investigate.

Inspect the shell and screws

Nintendo used distinctive security screws across many cartridge generations. A Game Boy Advance cartridge normally uses a single tri-wing screw, while Nintendo 64 games use security screws at the rear. A standard Phillips screw where a security screw should be is a warning sign, unless the shell has clearly been opened and repaired.

Look at the plastic moulding too. Genuine shells tend to have crisp edges, consistent texture and cleanly moulded internal markings. Fakes can feel lighter, more brittle or slightly different in colour. The rear text is worth checking: spelling errors, uneven lettering, missing mould marks and poorly defined Nintendo logos are all common counterfeit clues.

None of these tests is absolute on its own. Original games get repaired, cleaned and swapped into donor shells. Think in patterns. If the shell, label, screw and rear moulding all look wrong, there is no need to talk yourself into the purchase.

Check the pins, but do not mistake dirt for deception

The connector pins should be evenly aligned, clean enough to make good contact and seated properly within the shell. Tarnish, dust and light oxidation are normal on a 25-year-old cartridge. They can often be cleaned carefully with high-percentage isopropyl alcohol and a lint-free swab.

What is less normal is a thin, poorly fitting circuit board visible through the cartridge slot, pins that are excessively bright compared with the cartridge condition, or contacts that sit at a strange depth. Modern reproduction boards are often shaped differently from original boards, and the visible edge can reveal that difference.

Open the cartridge only when it is justified

For valuable purchases, inspecting the PCB is the strongest authenticity check. You will need the correct security screwdriver, a clean workspace and a light touch. Do not force screws, scrape the board, or open a sealed collectible simply to satisfy curiosity. For boxed games in collector condition, asking the seller for clear board photos may be the better option.

Once opened, look for an original manufacturer board with professionally produced traces, correct chips and printed markings appropriate to the release. Nintendo boards commonly carry Nintendo branding or recognisable board codes, although layouts vary by revision and region. Sega, NEC and other publishers have their own board conventions, so compare against confirmed examples for that exact title rather than relying on one universal rule.

Counterfeit boards often have a generic green PCB, messy soldering, black epoxy blobs over chips, or an arrangement that does not match documented originals. A blob is not always a fake on every platform, but it is particularly suspicious in games known to use conventional chips. Likewise, an original board may look different because it is a later production revision. The question is whether the whole board is credible for the game in hand.

Battery-backed saves deserve extra attention. Pokémon Game Boy Advance games such as Ruby, Sapphire and Emerald originally used an internal battery for time-based events, whereas FireRed and LeafGreen do not. A claimed original copy with the wrong battery setup should prompt more checks. A replaced battery, on the other hand, is routine maintenance and can be a positive sign when neatly done.

Test the game, but do not rely on gameplay alone

Many fake cartridges boot, save and play surprisingly well. Passing the title screen test is not the same as passing an authenticity inspection. Still, testing can expose issues that photographs cannot.

Try the game in an original console where possible. Check whether it starts consistently, saves correctly and retains that save after powering off. Play beyond the opening sequence. Some counterfeit carts fail during later areas, crash when a game saves, or lose progress after a short time.

For Game Boy Advance Pokémon titles, verify features tied to the original hardware and save system. For Nintendo 64 games, check that the save type behaves properly. If a cartridge claims to include a special feature, accessory support or a particular language version, test that claim rather than assuming the label tells the truth.

Assess the seller as carefully as the cartridge

A trustworthy listing normally includes sharp photographs of the front, back, pins and, for higher-value games, the PCB on request. Vague stock photographs, pictures taken from a distance and descriptions that avoid the word “authentic” are not automatic proof of wrongdoing, but they leave you carrying more risk.

Ask direct, polite questions: has the cartridge been opened, is the label original, has the save battery been replaced, and can the seller provide a photo of the board? The answer matters, but the willingness to answer matters too. A specialist retailer such as 8BitBeyond should understand why collectors ask these questions and describe condition clearly.

When buying through a marketplace, read feedback for comments about reproductions, returns and item condition. Use payment methods with buyer protection, retain screenshots of the listing and inspect the cartridge promptly after delivery. If it is not as described, raise the issue within the platform's stated timeframe rather than attempting repairs first.

Authentic, repaired or reproduction: value depends on honesty

Not every non-factory detail is a disaster. A genuine game with a replacement battery, cleaned contacts or a repaired shell can still be an excellent player copy at the right price. A reproduction cartridge can be useful for playing an expensive title that you would not otherwise own, provided it is clearly sold as a reproduction and priced accordingly.

The problem is misrepresentation. Original cartridges hold historical and collector value because they are the hardware released in that era, with the board, shell and production details collectors expect. A repro is not inherently worthless, but it should never command original-cart money.

Trust your inspection, take your time, and walk away when the evidence does not add up. There will always be another cartridge, but the confidence of placing a genuine piece of gaming history on your shelf is worth waiting for.