Play Mario Bros in Sonic World Online – Flash Game

Game Overview

"Mario Bros in Sonic World" is a wild, nostalgia-packed mashup that throws Mario into Sonic’s speedy universe—and it’s as chaotic and fun as it sounds! Imagine the plumber’s classic platforming meets Sonic’s loop-de-loops and high-speed zones, creating a quirky crossover that feels like a secret '90s arcade gem. You’ll jump on Goombas in Green Hill-style levels, dodge spikes with Mario’s signature moves, and maybe even question how these two gaming icons ended up in the same pixelated world.

This fan-made Flash game is a love letter to retro gaming, blending the best (and weirdest) of both franchises. It’s not official, but that’s part of its charm—like stumbling upon a bootleg VHS of your favorite cartoons colliding. Short, sweet, and packed with throwback vibes, it’s perfect for anyone who ever dreamed of seeing Mario outrun a Sonic-level avalanche. Just don’t tell Nintendo or Sega!