Clockwiser

DOSGames.com Review:  Rating: 5
Clockwiser is an inventive and now free puzzle game. Originally a commercial product, the game has graciously been released for free by its original developers. Racing against the clock, you must draw rectangles and rotate blocks clockwise (or counter-clockwise) to make the blocks on the left side of the screen match the blocks on the right side. It includes over 200 levels and later levels introduce new mechanics, like gravity, teleporters, and bombs. The game plays quite well (you can use keyboard or mouse, the latter of which is recommended) and looks good too. Definitely a hidden gem that you should try out. The main disadvantage is that you'll need to use the copy-protection sheet included in the ZIP file (Clockwiser load-up matrix) to solve the copy protection challenge.