Daily puzzle (2021-02-01)



Author: Vladimir Portugalov

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

Blacken some cells in the diagram so that in the remaining cells no number occurs more than once per row or column. All unblackened cells must be connected. Two blackened cells may not be adjacent, though may touch by a corner.

Example puzzle

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