This is the multi-game cartridge Champion Tennis, Baseball, Boxing, Soccer for the Sega Master System MK-2000 / Mark III / SG-1000M3, a used Japan-region cartridge with Japanese text.
The cartridge has been tested and is in working condition, though it does have some scratches.
The photos show the actual item you'll receive. Please verify your system is compatible with this Japanese Sega Master System MK-2000/Mark3/SG-1000M3 cartridge before buying.
