Play Super Mario World - Mega Rex Adventure Online

Mario World but everything’s been invaded by dinosaurs—spiked-shell dinos charge you instead of Koopas, secret exits are sneakier, and Yoshi’s got competition from these hulking Mega Rexes. Still feels like butter to control, just weirder.

Developer: Nintendo

Genre: Platform

Released: 1991

File size: 993.46 KB

Game Overview

Okay, so picture Super Mario World, but someone cranked the dinosaur chaos up to 11. That’s Mega Rex Adventure—a fan-made SNES romhack where Yoshi’s not the only reptile in town anymore. Suddenly, you’ve got these hulking Mega Rexes stomping around, Bowser’s goons look like they raided a fossil exhibit, and even the levels feel familiar but… wrong in the best way.

The first time I played, I rounded a corner expecting a basic Koopa and nearly jumped when a spiked-shell dino came charging instead. The controls are still that perfect Mario World feel—tight jumps, satisfying spin attacks—but everything’s just a little wilder. Some of the secret exits had me scratching my head longer than I’d like to admit.

If you’ve played the original to death and want that same cozy nostalgia with some teeth, this is the hack for you. Just watch out for the Mega Rexes—they don’t mess around.