Hats Miner Mining Helmet Safety Nonogram (20×20)
This is the Hats Miner Mining Helmet Safety 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
- 185 of 400
- Longest run
- 11
- Typical time
- 45-90 min
- Category
- Hats & Masks
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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 400 cells, 11%, so most of this board has to be argued for rather than read off. The most generous opening is row 12, which gives up 12 cells on its own. Straight line logic carries it to 65 cells and then stalls, so the last 335 need cross-referencing between a row and a column that share a cell. The finished picture fills 185 cells, and the longest unbroken run anywhere in the clues is 11.
About this category
Hats and masks make an unusually top-heavy category: most of it is full 20×20 boards, the rest sits at 15×15, and there is a single 10×10 as the only real warm-up. Proportionally that makes hats & masks the most 20×20-heavy set on the whole site — if you specifically want the big grids, there's a higher concentration of them here than anywhere else, the larger food & drink category included.
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