It was on the Dreamcast Web Browser 2.0 with SegaNet disc as an individual game for sure. It's very possible it was on some demo discs.
It's on Sega Smash Pack: Volume 1 as well, so all is good.
In reply to: Blazer175
posted by TrustyZeus
Isn't Sega Swirl contained in Sega Dreamcast demo discs?