This cartridge lets you run a fake Windows 3.1 on your Game Boy, complete with Minesweeper
It can't BSOD, either.

The Game Boy may have retired decades ago, but that hasn't stopped people from making new games and cartridges for it. In fact, as the technology behind the portable console gets broken open, more and more indie developers can join in and create games and tools for the Game Boy. Take, for instance, the GBS Windows cartridge, which lets you run a faux version of Windows 3.1 on your Game Boy.