Sonic 3D Blast (Prototype 73) Game

Sonic 3D Blast (Prototype 73) is a fascinating glimpse into what could have been—a quirky, experimental take on Sonic’s leap into the third dimension before the final game hit the SEGA Genesis. Unlike the polished (but divisive) isometric platforming of the retail version, this prototype plays faster, feels rougher, and oozes untamed '90s charm. Imagine Sonic tearing through vibrant, blocky levels with a slightly different physics engine, where the sense of speed is more reminiscent of his classic 2D outings—just with a bold (if awkward) twist.

For fans of Sonic’s golden era, this prototype is a nostalgic time capsule. It’s a chance to see how SEGA tinkered with bringing the Blue Blur into 3D before settling on the final design. Whether you’re a collector of gaming oddities or just love seeing Sonic in unexpected forms, this early build offers a fun, if unrefined, spin on hedgehog history. Not quite the finished product, but all the more interesting because of it!