Play Uno 2 : Small World Online
Uno but with a twist—cards start warping between hands and the rules shift mid-game while that little Game Boy speaker chirps away. Nothing beats slapping down a sneaky reverse card just as the AI thinks it’s got you.

Uno 2: Small World came out for the original Game Boy, though I can't recall who made it. It was one of those late-era releases that tried to squeeze a little more life out of the handheld, a simple card game trying to find its place among the platformers and RPGs.
You don't control a character; you just manage your hand of cards against one or more computer opponents. The goal is still to get rid of all your cards first, but the "Small World" twist means the play area is tiny, and cards sometimes jump between players' hands without warning. You have to pay close attention to the shifting rules, which can change color or direction at random, forcing quick recalculations. It's a fast, sometimes chaotic game that feels surprisingly tense for something so simple, especially when the AI suddenly turns your best laid plans upside down. The whole experience feels like trying to win an argument with a clever friend who keeps changing the subject.

Download Uno 2 : Small World ROM
You can download this ROM to play Uno 2 : Small World offline using an Game Boy emulator (Top Emulators).
*This ROM is provided for backup and educational purposes only.