via http://pdroms.de/genesis/mega-swirl-...b-genesis-game
Zontar‘s Mega Swirl is a fan adaptation of Sega Swirl, a puzzle game initially released in 1999. It’s basically samegame (those bubble-popping games you can get on the app store) with variations on the Dreamcast logo as game pieces.
http://gendev.spritesmind.net/forum/...pic.php?t=1486
