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| A fully functional customized Game Boy Color wrist watch running Pokémon Gold |
What happens when you take one of the most beloved handheld consoles of the late ’90s, shrink it down to the size of a wristwatch, and refuse to use emulation? You get the Time Frog Color – and yes, it’s exactly as absurd and brilliant as it sounds.
Chris Hackmann, better known in modding circles as LeggoMyFroggo, has pulled off what many thought impossible. He’s crammed a genuine, fully operational Game Boy Color into a 38 mm aluminum timepiece. No emulation. No Raspberry Pi running a software layer. Just real GBC hardware, tiny physical cartridges, and a whole lot of stubborn ingenuity.
Right from the start, Hackmann set three ironclad rules for himself. The watch had to use the original Game Boy Color CPU. It had to support physical game cartridges – no ROM files on an SD card. And when you weren’t gaming, it still needed to tell the time. Simple enough, right? Not even close.
Under the Hood: How a 38 mm Watch Became a GBC
To meet his self-imposed challenge, Hackmann turned to the classic Sharp SM83 processor – the very same brain found in Nintendo’s original handheld. He paired it with dedicated video RAM and squeezed in a 1.12-inch color display. That’s smaller than most smartwatch screens, but it’s 100% authentic GBC silicon.
There was one massive problem, though. That tiny LCD isn’t natively compatible with the Game Boy Color’s video output. Hackmann’s solution? A Raspberry Pi RP2040 microcontroller acting as a real-time signal translator. The irony isn’t lost on anyone: a modern, powerful coprocessor is now playing interpreter for a chip from 1998. But thanks to the RP2040’s small footprint and low heat output, everything fits snugly inside the 38 mm case – finished in that iconic metallic Nintendo purple and CNC-machined from aluminum.
If you’re feeling nostalgic and want to relive the original experience, you can still find official Game Boy Color consoles on Amazon – click here to see current prices and availability – though they’re fetching well over $100 these days.
The Cartridge Conundrum: No ROMs, No Problem
Most DIY portable console projects take the easy route: load a microSD card with legally dumped ROMs and call it a day. Hackmann refused. His third rule (physical cartridges only) meant he had to invent something entirely new.
He designed miniature Game Boy Color cartridges that slide into an M.2 slot – the same type of connector you’d find on a laptop SSD. Each tiny cartridge houses a legitimate game ROM chip, preserving the authentic “plug-and-play” feel of the original hardware. It’s over-engineered, impractical, and absolutely delightful.
And then there’s the battery. You’d expect a small lithium cell inside the watch case itself. Hackmann thought bigger – or rather, more flexible. He embedded the battery inside the silicone wristband and connected it via a flexible printed circuit. It sounds like a fire hazard waiting to happen, but the madman made it work. The trade-off? Shorter battery life than a stock Game Boy Color, which was already measured in hours, not days.
Playing Pokémon Gold on Your Wrist: The Real-World Test
The control scheme is where things get truly cramped. Hackmann installed tiny tactile switches under 3D-printed button caps – positioned exactly where you’d expect the D-pad, A, B, Start, and Select to live. In practice, playing anything action-heavy is a thumb-cramping exercise in patience.
But for proof of concept, he loaded up a mini cartridge of Pokémon Gold. The game booted. It ran. Save files worked. You could walk around, battle wild Pokémon, and even save your progress. On a watch.
Of course, the 1.12-inch screen means text is nearly illegible, details vanish into pixel soup, and there’s no audio whatsoever. Hackmann didn’t even try to add a speaker – there simply wasn’t room. The video demonstration on his YouTube channel shows the watch in action, and it’s both mesmerizing and mildly ridiculous.
👉 Watch the full build and demo here: LeggoMyFroggo’s Time Frog Color on YouTube
“A Right to Exist Just Ahead of Macaroni and Cheese With Ketchup”
Let’s be honest: the Time Frog Color is not a practical gaming device. The screen is too small. The controls are clunky. Battery life is short. There’s no sound. And building one requires CNC machining, custom PCB design, and a willingness to solder flexible circuits into a silicone band.
But that’s not the point.
In his closing remarks, Hackmann perfectly summed up the project’s bizarre charm:
“If this all sounds needlessly complicated, have you even thought about this? It’s a Game Boy Color with a less-than-optimal experience, shorter battery life than most, and a right to exist just ahead of macaroni and cheese with ketchup. But in the end, I’m still shocked that I have a real, playable Game Boy Color, in at least a technical sense, on my wrist.”
That quote captures the entire spirit of modern console modding. It’s not about creating the best way to play old games – that’s what Analogue Pocket and emulation handhelds are for. It’s about pushing hardware to its absolute limit, bending original components to your will, and creating something that shouldn’t exist, yet somehow does.
Should You Try This at Home?
Unless you’re an electrical engineer with a CNC machine, a reflow oven, and a lot of free time, probably not. Hackmann’s build is a one-of-a-kind proof of concept, not a kit you can buy. The Bill of Materials alone – original GBC CPU, RP2040, custom flex PCBs, M.2 slots, and the aluminum case – would set you back several hundred dollars before you even factor in the dozens of hours of labor.
But for those who appreciate the craftsmanship, the Time Frog Color is a masterpiece of constraint-based design. It’s a middle finger to the “just use an emulator” crowd and a love letter to the engineers who built the original Game Boy Color. It’s also a fantastic reminder that the best mods aren’t the most practical – they’re the ones that make you stop and say, “Wait, that’s actually real?”
And yes, it tells the time when it’s turned off. Provided you haven’t drained the wristband battery chasing down a shiny Pidgey.
Have you ever attempted a ridiculous console mod? Or are you happy just playing your old cartridges the old-fashioned way? Drop your thoughts in the comments – and if you want to see more from LeggoMyFroggo, check out his YouTube channel for the full Time Frog Color build log.