An insanely ambitious attempt to adapt 2D style Sonic level design and game flow to a 3D engine and it... it works? Somehow? A small team of rotating volunteers over the course of 20 years sorta kinda cracked the code on how to make a 3D Sonic game that feels like the 2D ones?

Play it if you're a Sonic fan. Hell, play it if you aren't. It's a Sonic game that runs on a modified Doom engine. And you can beat it in an afternoon. Don't miss it.