YouTuber builds a pocket e-ink Game Boy emulator that's actually playable

Hardware creator Wenting Zhang has built a pocket-sized Game Boy emulator running on an e-ink touchscreen — specifically the M5Stack PaperS3 ereader — and claims it hits a refresh rate that makes Pokemon Blue genuinely playable. That's a bigger deal than it sounds, because e-ink displays are notoriously sluggish.

The secret sauce is four years of prior work. Before tackling this emulator, Zhang spent years building an E Ink monitor capable of 60 fps, using far more memory than a standard epaper display and combining greyscaling with dithering techniques to smooth out the refresh. That earlier project is open source and still has an active crowdfunding campaign. The Game Boy emulator — dubbed Paperboy — runs on an ESP32 SoC and leans on that same high-refresh-rate driver. It handles original Game Boy titles well enough, with slower, visually simple games like Pokemon Blue and The Legend of Zelda: Link's Awakening being the sweet spot. Game Boy Color emulation is still a work in progress due to hardware and software limitations. Audio was its own puzzle: the M5Stack PaperS3's speaker is tiny, so Zhang filtered Nintendo's soundtracks through a single crunchy tone rather than trying to reproduce them faithfully. It's lo-fi, but it has character. Fast-paced games like Tetris expose another weak point — the touchscreen controls struggle to keep up, and Zhang admits Bluetooth controller support isn't reliable yet.

E-ink gaming has always been a niche curiosity. The technology's slow refresh and ghosting make it a poor fit for anything that moves quickly, which is most games. Zhang's earlier 60 fps E Ink monitor work was already an impressive technical outlier, and shrinking that know-how down to a pocket device is a natural next step. The open source nature of both projects means other hardware tinkerers can build on the work directly.

The Paperboy repository is publicly available for anyone who wants to dig in or mod it further. Zhang's own suggestion for the device's best use case leans toward slower, text-heavy experiences — and the open source code makes it a tempting base for visual novel fans looking for a genuinely unusual handheld.