http://www.bubble-islands.com/play/index.html

Bubble Islands is strongly inspired by Puyo Puyo, a game developed
in 1991 by the Japanese company Compile.
The version currently online at the time of writing is a finalist
of the 2007 IGF Festival in the Best Web Browser Game category. The
game isnt finished yet but is already playable!
Two different modes are available: the arcade mode and the puzzle
mode.
Bubble IslandsThe object of the game in the arcade mode is to
defeat each of your opponents in a duel by filling their grid up to
the top with parasites. To do so, connect at least 4 bubbles of the
same color to make them disappear. The faster you connect your
bubbles, the better.
In the puzzle mode, your goal is to remove ALL the bubbles from
each of the 10 islands in each level. Once youve completed a
level, the next one is unlocked.