Each puzzle consists of a square grid with numbers appearing in all squares. The object is to shade squares so that the numbers don't appear in a row or column more than once. In addition, shaded squares must not touch each other vertically or horizontally while all un-shaded squares must create a single continuous area. There is only one unique solution for each puzzle.

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Game Instructions: Hitori Light is played by shading and un-shading squares in a grid. First click un-shades the square, second click shades the square and the third click brings the square back to its original state.