Spray Wave Nonogram (20×20)
This is the Spray Wave nonogram — a 20×20 picture logic puzzle. Use the number clues beside each row and column to work out which squares are filled, and the picture appears as you go. Every square can be deduced; you never have to guess.
About this puzzle
- Size
- 20×20
- Difficulty
- Hard
- Filled squares
- 120 of 400
- Longest run
- 10
- Typical time
- 45-90 min
- Category
- Nature
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How this board opens
The overlap rule is stingy here: one sweep of it across every row and column yields 46 of the 400 cells, 12%, so most of this board has to be argued for rather than read off. The most generous opening is row 20, which gives up 20 cells on its own. 2 of the 40 lines are decided outright by their clues, with no room to slide. Straight line logic carries it to 292 cells and then stalls, so the last 108 need cross-referencing between a row and a column that share a cell. The finished picture fills 120 cells, and the longest unbroken run anywhere in the clues is 10.
About this category
Weather and the seasons, mostly: rain falling, a cloud with sun behind it, wind as curled strokes of moving air, a snowdrop pushing up through the ground, summer rays, the bare tangle of roots, an umbrella, a pair of sunglasses, a thermometer with its three scales, a campsite. It is the shelf with the fewest man-made objects on it, and it behaves differently from the rest of the catalog because of that.
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