Alarm Alert Disaster Nonogram (15×15)
This is the Alarm Alert Disaster nonogram — a 15×15 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
- 15×15
- Difficulty
- Hard
- Filled squares
- 69 of 225
- Longest run
- 5
- Typical time
- 20-40 min
- Category
- Travel
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How this board opens
The overlap rule is stingy here: one sweep of it across every row and column yields 43 of the 225 cells, 19%, so most of this board has to be argued for rather than read off. The most generous opening is row 1, which gives up 15 cells on its own. 3 of the 30 lines are decided outright by their clues, with no room to slide. Straight line logic carries it to 43 cells and then stalls, so the last 182 need cross-referencing between a row and a column that share a cell. The finished picture fills 69 cells, and the longest unbroken run anywhere in the clues is 5.
About this category
Buses, cars, a taxi, a truck, a gearshift, trains running into a tunnel, ships from a small fishing boat to a modern hull at a dock, a sextant, a suitcase, a hotel reception desk, and the signage that surrounds all of it — a stop sign, a parking sign, traffic lights, the pictograms on a washroom door. It is the shelf of getting somewhere, and it is built almost entirely from objects that were designed to be recognised quickly.
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