The puzzles below are current daily and contest puzzles. These puzzles are competitive and you have to register to solve them and participate in the 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 the daily 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.
Author: Andrey Bogdanov
Place digits from 1 to 4 into the grid, so that each digit appears exactly once in each row and column. No 2x2 square can be completely filled with digits.
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.
Author: Vladimir Portugalov
Place digits from 1 to 9 into the grid, so that each digit appears exactly once in each row and column. No 2x2 square can be completely filled with digits.
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.