Sonic the Hedgehog

This is a ROM hack of the original Sonic the Hedgehog for the SEGA Genesis, specifically a revision by the known hacker Stealth that swaps out Sonic for Knuckles the Echidna. The hack takes the standard Sonic 1 ROM from the USA and Europe region set and applies a character swap, letting you play through the entire game as Knuckles with his unique abilities like gliding and climbing. It's a fan-made modification, not an official release, and it's been popular among the modding community for years. Gameplay follows the classic Sonic 1 structure: you run through Green Hill Zone, Marble Zone, and the other familiar zones, collecting rings, defeating badniks, and making it to the end of each act. The big twist here is that Knuckles handles differently than Sonic. He can glide by jumping and pressing down, cling to walls and ceilings, and climb up certain surfaces. This changes how you approach level navigation, since some platforming sections become easier or more complex with his moveset. The physics are tweaked to accommodate Knuckles' unique feel, but the core objective remains the same: reach the goal ring, beat the boss at the end of each zone, and ultimately stop Dr. Robotnik. If you've played Sonic 1 to death and want a fresh experience, this hack delivers exactly that. It's not a full conversion or a new story, but swapping the character remodeled the game enough that even veterans might find new routes or secrets. The hack has been refined through revisions, and Rev 1 is a polished take. It's a simple, focused modification that does one thing well, and for fans of Knuckles or the classic Sonic style, it's a fun way to revisit Green Hill with a different moveset. Just keep in mind it's a fan project, so expect the original graphics and music with only the character sprites changed.