MetroBoy

MetroBoy is a collection of highly experimental and extremely low-level Game Boy simulators that aim to replicate the original hardware at the gate and transistor level rather than through traditional high-level emulation. The project includes multiple related implementations, such as GateBoy and LogicBoy, which simulate the internal circuitry of the Game Boy chip based on reverse-engineered die images. This approach allows for an unprecedented level of accuracy, capturing even subtle electrical behaviors and timing quirks that are typically abstracted away in standard emulators. However, this level of detail comes at a significant performance cost, making the simulator much slower than conventional emulators. The project is primarily intended for research, hardware preservation, and deep technical exploration rather than everyday gameplay. It also includes extensive testing frameworks to validate behavior against known hardware benchmarks and test ROMs.