Sonic 1X4

Sonic 1X4 is a fan-made modification of the original Sonic the Hedgehog for the Sega Genesis. It is a ROM hack that alters the game to support multiplayer gameplay, allowing up to four players to race through levels at the same time. The exact creator and release date are not widely documented, but the hack has been shared within the ROM hacking community for years. Despite its unofficial status, it remains a notable experiment in expanding a classic single-player platformer into a chaotic group experience. The core gameplay is identical to the original Sonic the Hedgehog: you control Sonic through vibrant zones like Green Hill and Marble Zone, collecting rings, avoiding obstacles, and defeating Dr. Robotnik's badniks by spin-jumping. The key addition is simultaneous multiplayer, where each player controls their own Sonic (sometimes with different colors) and competes to reach the end of each act first. The physics, level design, and music are largely untouched, so the familiar loop-de-loops and speed-based platforming remain intact. This hack is worth trying for anyone who loves the original Sonic and wants to share that experience with friends in a local multiplayer setting. It turns a solo speedrun into a frantic, competitive race that often devolves into laughter or friendly sabotage. The hack is not polished - expect some graphical glitches or odd spawn points - but that's part of its charm as a community creation. If you enjoy retro gaming anomalies or just want a new way to play a classic, Sonic 1X4 delivers a unique twist.