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 are displayed. The game can be difficult at first, but the techniques are easy to learn. There are three skill levels - each level the board gets bigger, and the game much more hard to solve.

Square-Off is an excellent exercise for the brain. But watch out, it can be very addicting…

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Paint by numbers, also known as Japanese puzzles, nonograms, pic-a-pix, picross puzzles, pikurosu, hanjie, griddlers, or Edel, are logic puzzles in which cells in a grid have to be colored (or left blank) according to numbers given at the side of the grid to reveal a hidden picture. The numbers measure how many unbroken lines of filled-in squares there are in any given row or column. For example, a clue of “4 8 3″ would mean there are sets of four, eight, and three filled squares, in that order, with at least one blank square between successive groups.

These puzzles are often black and white but can also have some colors. If they are colored, the number clues will also be colored in order to indicate the color of the squares. Two differently-colored numbers may or may not have a space in between them. For example, a black four followed by a red two could mean four black spaces, some empty spaces, and two red spaces, or it could simply mean four black spaces followed immediately by two red ones. [Wikipedia]