Why I haven't got anything done yet this morning

This game is very addictive. And if you have any tendency at all towards obsessive compulsive disorder, you shouldn't go anywhere near it. It's like tidying. But even more fun!

Two hints, though:
(1) choose the large window option -- you'll need it once you get past level eight.
(2) if you find it seems a bit repetitive after a few levels, try the shuffle button on the right.