AquaPuzzle Pentic 4.2
When I first looked at AquaPuzzle Pentic, I figured it would be another jigsaw puzzle game -- a bunch of pieces scattered across the screen with a faint image of the completed puzzle behind it.
Instead, I found a game in which I had to figure out which puzzle piece went in the correct place, hoping I didn't guess wrong and run out of fitting pieces.
That turns out to be the game's strongest point; you are forced to think logically instead of just placing pieces where you think they may fit. You are given a list of the next four pieces that are coming. Hopefully it's enough information. I spent a long time making sure the first level could even be completed.
I was, and still am, totally hooked on AquaPuzzle Pentic. Options for both full screen and window modes are available, so whether you're at home or at work, you can give your mind a little test.