How to spot a repro

This is the single most reliable tell, and it means opening the shell with a tri-wing screwdriver. A genuine cartridge has a Nintendo-made board: tidy, with a printed Nintendo logo, date codes and coded, often epoxy-blobbed chips. A repro usually has a plain green board with a microSD slot or a single generic flash chip and no Nintendo markings.

Gen 1 and Gen 2 games save to a soldered coin cell with welded tabs, mounted flat against the board. If you see a removable coin-cell holder/socket, or a battery that looks like a modern CR2032 clipped in, treat it as a repro. Genuine carts never use a user-removable socket.

Originals use a slightly textured, matte label with crisp, finely registered printing and accurate colours. Repro labels are often too glossy, too saturated, slightly blurry, or show visible inkjet dot patterns under a loupe. Check the small print and ESRB/age-rating logos closely.

Genuine shells have clean moulding, consistent colour, and a correctly embossed or recessed Nintendo logo and model text on the back. Repro shells can feel lighter or more brittle, have soft or wrong-font text, visible mould seams, or screws that don't match the era (genuine carts use a Y-tip/tri-wing screw, not a Phillips).

A sealed or mint Crystal for a fraction of the going rate is almost always a repro or a resealed fake. Learn the realistic market range (see each game's page) and be suspicious of anything far below it, especially in bulk 'lots'.