Square-Off is a puzzle game, based on the japanese "nonogram" puzzles (Sometimes called Griddlers, or paint by numbers). Your object in the game is to uncover all the black squares in the grid.
To help you solve the puzzle, the number of black squares in each row and column is displayed. The game can be difficult at first, but the techniques are easy to learn. There are 3 skill levels - each level the board gets bigger, and the game much more hard to solve.
Square-Off is an enjoyable exercise for the brain. But watch out, it can be very addicting...