Cortex-M7, actually! The STM32H7B0 is a surprisingly capable processor. The main limitation of the Game and Watch platform is the lack of any standard external

Cortex-M7, actually! The STM32H7B0 is a surprisingly capable processor. The main limitation of the Game and Watch platform is the lack of any standard external interface -- while the system has a USB port, it's only used for charging. I've seen a couple of creative solutions to the problem, but they all require some pretty significant soldering skills.