You won't find a 1:1 port of Watch Dogs for your old DMG-01 Game Boy. However, the spirit of "hacking the system" lives on in the modding community. If you see a link promising a 100MB download of the full game for an 8-bit handheld, your best bet is to before you get hacked yourself!
Often, "highly compressed" files for impossible platforms are shells for malware. Always be cautious when downloading files that claim to do the impossible. 3. How to Get the "Retro" Watch Dogs Experience
Since Watch Dogs is a modern, high-fidelity PC and console title, it cannot run natively on Game Boy hardware. However, in the world of "highly compressed" gaming and retro-emulation, people often look for unique ways to bridge that gap. Here is a blog post exploring this concept. watch-dogs-pc-game-download-highly-compressed-gameboy
Using a modern handheld (like a Steam Deck or a modified Game Boy shell with a Raspberry Pi inside) to stream the PC game via Wi-Fi.
The closest official portable experience to the original Game Boy's successor. You won't find a 1:1 port of Watch
The original Game Boy runs on an 8-bit processor with a monochrome screen. Watch Dogs requires multi-core CPUs and modern GPUs. You can compress files, but you can’t compress logic . A Game Boy literally doesn't have the "vocabulary" to read the code of a modern PC game. 2. What "Highly Compressed" Usually Means
A fan-made project where someone recreates the feel of Watch Dogs using retro graphics. Think 8-bit Aiden Pearce hacking a pixelated vending machine. How to Get the "Retro" Watch Dogs Experience
If you want to play Watch Dogs with a handheld, retro vibe, here is the legitimate way to do it: