I’ve been spending way too much time lately playing Buggle at the Casual Collective website. It’s essentially a competitive chain-reaction game.
It takes a couple of tries to get the hang of it, but once you do, you’ll find it an entertaining diversion. It’s sort of like combative Tetris, jujitsu Tic-Tac-Toe, or Connect Four mixed with Laser Tag.
Just get a free account and try it.