Celsius Fahrenheit Kelvin Nonogram (20×20)
This is the Celsius Fahrenheit Kelvin 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
- Normal
- Filled squares
- 82 of 400
- Longest run
- 8
- Typical time
- 45-90 min
- Category
- Nature
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How this board opens
This one opens itself. One sweep of the overlap rule — every row read against its clue lengths, then every column — is worth 256 of the 400 cells, 64% of the board, before you have deduced anything of your own. The most generous opening is row 1, which gives up 20 cells on its own. 14 of the 40 lines are decided outright by their clues, with no room to slide. From there the board finishes on row-and-column logic alone — there is no point where you have to try a cell both ways and see which one breaks. The finished picture fills 82 cells, and the longest unbroken run anywhere in the clues is 8.
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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