PlanetWeb Web Browser 2.0 w/ Sega Swirl - Sega Dreamcast (Very Good)
The object of the game is simple. A screen fills with multi-colored swirls, and then you must remove the whole screen. A swirl removed will also remove all neighboring swirls of the same color. Gravity affects the remaining swirls, and the whole mass contracts to the left of the screen as you remove more and more.
Scoring is based on combos or number of swirls removed simultaneously. Obviously, more swirls=higher points, but single swirls actually remove points. You have to play a balancing act between removing huge masses of swirls and being left with non-matching sets, or removing smaller sets and possibly missing out on a huge combo score.