Free games and jigsaw puzzles are fun for games lovers. AlterJig is one of them, it is a set of tile-based jigsaw games and puzzles. You select graphics supplied with the games or create your own puzzles from any bitmaps.
When you select "new game", AlterJig scrambles the puzzles and challenges you to restore the pictures by rotating groups of four tiles to get the tiles back to their proper positions. Tile rotation is controlled by left and right mouse buttons. It sounds easier to solve than it is. There is a brief help file, but the demo mode helps you understand the games, which are pretty self-explanatory.