Example puzzle

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This is an example puzzle. You can solve it the same way as you would solve competition puzzle, but result never stored. You can reveal an answer for the puzzle by clicking "Show answer" link.

No Four in a Row

Author: Andrey Bogdanov

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Place either an ’X’ or an ’O’ into each empty cell such that four consecutive ’X’s or ’O’s do not appear horizontally, vertically or diagonally.

Example puzzle

Grid control: Click the mouse button at the selected cell to change the content of the cell. More details about grid control are at the help page.