Okay, so Billy and Mandy: Super Zero is one of those old-school Flash games where you play as Billy—except he's in this weird sci-fi nightmare instead of his usual dumb antics. You're stuck on some creepy abandoned planet full of maze-like corridors, and mutants are everywhere. Like, the kind that just shamble toward you in that classic Flash-game way.

Your goal? Clear out all the mutants in each level to unlock a portal to the next one. It's simple, but the layouts get trickier, and sometimes you’re just running in circles trying to find the last enemy. The art’s got that early 2000s Cartoon Network vibe—blocky, kinda janky, but in a way that makes it feel like a lost episode. If you’ve got nostalgia for Flash games, this one’s a weird little time capsule.