The original of this hardware test cartridge was released in 1995 and looked like a Game Genie. It was quite the large piece of kit, which is a rare piece to find in today's world.
We have created custom versions in a regular-sized cartridge. These handy cartridges run a series of tests which run diagnostics on your Game Boy console to make sure everything's working as it should be. Things such as the button inputs, audio, screen, etc.