Play Onslaught emulator game online in the highest quality available. Onslaught is a Sega Genesis game that you can enjoy on Play Emulator. This SEGA game is the US English version that works in all modern web browsers without downloading. Onslaught is part of the Arcade Games and Action Games you can play here. PlayEmulator has many online retro games available including related games like Yu-Gi-Oh! GX Spirit Caller, Wolverine: Adamantium Rage, and ESPN X-Games Skateboarding.