Play GameShark Online BIOS (Unl) Online

You type in janky cheat codes and watch your Game Boy games glitch out in bizarre ways—half the fun is seeing what breaks. Feels like hacking your childhood cartridges without the screwdriver.

File size: 23 bytes

Game Overview

GameShark Online BIOS (Unl) is basically the closest thing you'll get to hacking your Game Boy Color without actually cracking it open. It's not a game—more like a weird little toolbox that lets you poke at your other GBC cartridges with cheat codes. The interface feels straight out of 1999, all blocky menus and cryptic options, but there's something weirdly satisfying about typing in a string of numbers and suddenly making your Pokémon invincible.

Half the fun is seeing what breaks when you push things too far. I once turned Link into a glitchy mess of pixels by messing with the wrong values—no regrets. It's definitely niche, but if you grew up scribbling GameShark codes on notebook paper, this thing hits different. Just don't expect it to hold your hand.

Honestly? It's less about "winning" and more about the dumb grin you get when you finally make Mario walk through walls.