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The puzzle below is a current daily puzzle. This puzzle is competitive - you have to register to solve it and participate in the daily competition. To register click Login link in the top right corner.

You can use the scores page to see the results of other competitors for this puzzle.

All the puzzles from the previous days are available at our archive page. Puzzles which are older than 5 days do not affect the score table and can be attempted without registration.

Double Block

Author: Dmitry Grishchenko

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Do you want to restart the puzzle? All progress will be lost!

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Congratulations! The puzzle has been solved correctly!!

Fill in some cell with digits from 1 to 4. Each row and column should contain two empty cells and every digit exactly once. The numbers outside of the grid indicate the sum of the numbers between the two empty cells in that particular row or column.

Example puzzle

Grid control: Click at a cell reveals the value chooser. Click at the selected value changes the state of the cell. More details about grid control are at the help page.