Onslaught is a classic Sega Genesis title featuring vibrant 16-bit graphics and gameplay. Experience this beloved title from the golden age of console gaming on Sega's iconic 16-bit powerhouse. Originally developed for the Sega Genesis / Mega Drive during Sega's 16-bit era of the early 1990s, Onslaught remains a standout title in the Sega Genesis library. The game features fast-paced action, making it a memorable entry in the action genre.
How to Play Onslaught
Click Play Now to launch Onslaught directly in your browser — no downloads or plugins needed. Use the Arrow Keys to move, Z/X/C for action buttons, and Enter to start. You can also connect a USB or Bluetooth gamepad for a more authentic feel.
Genesis games are known for their speed, bold art styles, and memorable soundtracks powered by the Yamaha YM2612 sound chip.
Save states let you save your progress at any point. Create a free account to sync saves across devices. Press F11 for fullscreen mode.
To play Onslaught, simply hit the "Play Now" button on this page. The game loads instantly in your browser using an embedded emulator — no plugins, downloads, or setup required.
Is Onslaught free to play?
Absolutely! Onslaught is 100% free on RetroVault.GG. No subscriptions, no hidden fees — just open the page and play.
What console is Onslaught for?
Onslaught was originally released for the Sega Genesis. On RetroVault.GG, you can play it online in your browser without needing the original console.
What genre is Onslaught?
Onslaught is a action game. It was made for the Sega Genesis.
Can I play Onslaught on my phone?
Yes, RetroVault.GG works on mobile browsers. Visit the game page on your phone or tablet and tap Play Now to start playing Onslaught.