Puzzle #55 - Look-Air

I made this puzzle after teaching myself some of the more advanced standard Look-Air techniques. This puzzle should be pretty difficult, and a good illustration of how a few well-placed clues can work together to create unusual interactions in this puzzle type.

Rules

Shade some cells so that each orthogonally-connected area of shaded cells forms a perfect square. Clues may be shaded, and each clue represents how many cells are shaded from among the clue cell itself and its orthogonal neighbours. Two shaded square areas of the same size must not have an unobstructed run of unshaded cells, horizontally or vertically, anywhere between them.

Difficulty: 7/10





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