Top rating improvement of the month
Hunsudoku 149
_AtomicNeoN_ 133
yuchi 106
Leonid Kholopov 106
Sashika 90
Top commenters of the month
Иван Грищенко 14
O-le_o-le 10
Adam Bissett 4
shipopala 3
Andrey Bogdanov 2

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.

Fortress Sudoku

Author: O-le_o-le

Sorry, but your browser is not supported. Try to setup the new version.

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

Congratulations! The puzzle has been solved correctly!!

Fill the grid with the digits from 1 to 6 so that each row, column and outlined area contains each digit exactly once. A digit placed in a grey cell should be greater than digits in adjacent white cells.

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.