Example puzzle
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.
Fortress Sudoku
Author: Andrey Bogdanov
Fill the grid with the digits from 1 to 9 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.
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.