Black Boxes comes from Kevin McLean and Konrad Bajtyngier. It's quite good. First, combine the pink box - two at a time - to create 1 red box. Combine 2 red boxes to form 1 Black Box.
Next, combine 2 light blue boxes to make 1 dark blue box. Then 2 blue boxes to make 1 Black Box.
When 3 Black Boxes are lined up, you score points. If you can get a super cluster of Black Boxes, you'll score major points.
There are 2 versions of this game: the first: you are given a time limit. The second, more cerebral version, you get 40 moves.
My high score is around 4600. I like this game.
Other Point Scoring Games Worthy of Your Time
Four Straight Lines
Virus Pop Smash