Nitre Nonogram (15×15)
This is the Nitre 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
- 64 of 225
- Longest run
- 8
- Typical time
- 20-40 min
- Category
- Alchemy
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How this board opens
A first sweep of the overlap rule down the rows and across the columns settles 109 of the 225 cells, about 48%, which is enough of a skeleton to work outwards from. The most generous opening is row 1, which gives up 15 cells on its own. 6 of the 30 lines are decided outright by their clues, with no room to slide. Straight line logic carries it to 157 cells and then stalls, so the last 68 need cross-referencing between a row and a column that share a cell. The finished picture fills 64 cells, and the longest unbroken run anywhere in the clues is 8.
About this category
Symbols, vials, and half-finished experiments — the alchemy set leans into the visual clutter of a wizard's workbench, which turns out to be a good fit for nonograms: lots of small internal detail means real clue interplay between rows and columns, not just one big blocky silhouette. Most of the set sits at 15×15, the size where cross-referencing actually starts to matter, with a couple of full 20×20 boards for anyone who wants a longer sit-down solve and a few 10×10s at the gentler end.
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