Play Beyond Zero Tolerance (Proto) Online
You and a friend blast through dim spaceship corridors in split-screen, mowing down mutants with that janky, early '90s Genesis charm—rough edges and all.

Game Overview
Beyond Zero Tolerance (Proto) is one of those weird, fascinating Sega Genesis relics that makes you wonder what could’ve been. It’s a rough-around-the-edges prototype of Zero Tolerance, and honestly? The janky bits kind of make it cooler. You and a buddy can dive into split-screen co-op, blasting through a creepy spaceship crawling with mutants—think top-down Doom but with that grimy early '90s sci-fi vibe.
The atmosphere is thick, even with the Genesis’ limited palette. Dark corridors, flickering lights, and enemies that lurch at you just a little too fast. It’s not polished, but that’s the point—you’re playing a piece of gaming archaeology. If you’re into obscure retro stuff or just love seeing how ambitious 16-bit games could get, this proto is worth booting up at least once.
Just don’t expect a finished product. Half the fun is spotting the weird quirks and imagining where it might’ve gone.

Download Beyond Zero Tolerance (Proto) ROM
You can download this ROM to play Beyond Zero Tolerance (Proto) offline using an Sega Genesis (Mega Drive) emulator (Top Emulators).
*This ROM is provided for backup and educational purposes only.