Puzzles Galore. A guy named David Grey developed it about 20 years ago, and I've enjoyed it since I downloaded the free copy back in 2000. SInce it's not as big as puzzles you'd do on a table top (depending on your monitor) I've kept them small in number. Just bumped it up to 500 pieces. I do a bit here, a bit there. Every time I pull it up, I find a dozen or so pieces, but when I can't find any more, I close it out, and later, when I go back, I have a fresh outlook and find the first piece within a few seconds. LOL. then another dozen or so until I can't find any more.