If you've never played Bejeweled before, you're probably in the minority of human beings in the developed world. This series of puzzle games is a classic and thoroughly addictive in just about every form it's ever taken. After being available on iOS and Facebook for a while, Bejeweled Blitz has reached Android, and it's free to download (you should know what that means by now).
Bejeweled Blitz is based around the tried-and-true matching gameplay with some additional social elements built in. There is also a time limit, hence the "blitz" part. You can play against Facebook friends, or just spam your news feed with Bejeweled updates.