I bought this with the Dreamcast at the UK launch of the machine. I was absolutely amazed with the graphics and speed. The first level with a section where a killer whale is destroying a jetty behind you while you run into the screen was unlike anything I’d seen before.
You play as several characters rather than just Sonic, and each have different mechanics and their own plot in the overarching story.
Coming back to the game I found the camera and controls are fussy and difficult, and the game itself really quite buggy. It feels like it was created in a big rush, and not actually finished.