The second attempt to run Duel Contest devoted to the site anniversary will take place on the 2nd of May from 15:00 to 16:00 (GMT).
The contest uses duel rules - all participants solve puzzles simultaneously. In each round a solver competes with the only opponent which changes for every puzzle.
Registration is required before the contest starts for seeding participants.
Registration link and more details about the contest rules are here.

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 score table and can be attempted without registration.

Heyawake

Author: Vladimir Portugalov

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Blacken some cells in the grid so that no two black cells have a common edge and all white cells are connected. No horizontal or vertical sequence of white cells may span more than two outlined areas. Numbers inside outlined areas indicate the number of black cells in that area. Cells with numbers may be blackened.

Example puzzle

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