Play Ultimate Robotnik Duels Online
Pick Sonic or some wildcard like Raiden, then mash buttons until someone’s health bar vanishes—Robotnik’s floating arms are weirdly satisfying to spam. Flash-era jank means every punch feels like it might glitch through the floor, but that’s why you keep rematching.
Note: Right click and select full-screen for best experience
Game Overview
Ultimate Robotnik Duels is one of those old-school Flash brawlers where you pick a character—Sonic, Robotnik, even weird curveballs like Mario or Raiden—and just go at it. The roster’s surprisingly big for a fan game, and half the fun is figuring out who feels right. (Turns out Mecha Sonic hits like a truck, but good luck landing those slow punches.)
Matches are quick and messy, with health bars draining fast if you don’t dodge. The AI’s not bad, but grabbing a friend for local versus is where it shines—nothing like watching someone panic when you’ve got Robotnik’s weird floating mech arms cornering them. It’s janky in that classic Flash way, but that’s part of the charm.
