PuzzleJig creates sliding-block puzzles out of any .bmp and .jpeg files, and then lets you solve them. The game is not hard to play. If you get stuck, the program can show you a move. PuzzleJig also tells you how many pieces are in the correct position -- plus it will let you look at the assembled picture at any time. This game is interested for any ages. You can save unfinished puzzles for later completion (in registered variant).