Wuzi Chess

Otherwise known as Connect 5, this classic board game that's been converted to a free flash game online is played much like Othello except the object is to get 5 of your pieces in a row before your opponent. (BE AWARE: the Replay button doesn't seem to work on any version of the game we've found, but refreshing the window does work--and this game is so cool we just had to include it anyway)

(rating: 6.95)