Graffiti/en

Instructions

Paint some cells black and then draw a single noncrossing loop, travelling along all remaining cells, moving horizontally or vertically with connecting the centers of the squares. The numbers outside the grid indicate the lengths of blackened cell blocks in the corresponding directions, in order. If there is more than one blackened block in a row or column, there must be at least one white cell between the blocks.

History

Invented by Riad Khanmagomedov (Russia).