At the beginning of a nonogram, the picture is hidden inside an empty grid. The numbers around its edges tell you how to uncover it, one justified mark at a time. Each completed row changes what you can work out about the columns crossing it.
That movement from a small certainty to a larger conclusion is part of what makes nonograms a good fit for the kind of mystery we're developing at Oddly Clever Press. First you work out what the grid shows. Then you consider what that information means for the case.
Read each number as a run
In a standard black-and-white nonogram, each number describes a consecutive run of filled cells in that row or column. A clue of 3 means one unbroken group of three filled cells.
When a line has more than one number, the runs appear in the stated order, with at least one empty cell between them. Across a row, read left to right. Down a column, read top to bottom. A clue of 2, 1 means a group of two filled cells, then at least one empty cell, then a single filled cell. You can't swap those groups around.
There may also be empty cells before the first run or after the last. The numbers tell you the lengths and order of the filled groups; the intersecting clues help determine their positions.
Start with a five-cell row
Imagine a row containing exactly five cells and a single clue of 5. All five cells must be filled. There is no room for a gap, and that one decision now gives you information in five columns.
Now imagine another five-cell row with the clue 1, 1. It needs two separate single filled cells, with at least one empty cell between them. The first and third cells could be filled. So could the second and fifth. Those examples fit the row clue, but the clue alone doesn't tell you which arrangement belongs in the finished puzzle.
To decide, look at the columns. A cell already known to be empty might rule out one arrangement. A cell already known to be filled might narrow the possibilities further. Keep only the placements that agree with everything you've established.
Notice what must overlap
A five-cell row with a single clue of 3 offers another useful starting point. The run could occupy the first three cells, the middle three, or the last three. Every possible position includes the center cell, so that cell must be filled.
You still don't know the full position of the run. Mark the center, then use the crossing column clues to continue. This habit matters: record what the evidence requires, and leave the remaining possibilities open.
Empty cells deserve clear marks too. Follow the book's instructions for marking them so you can distinguish a confirmed empty cell from one you haven't investigated yet.
Use the picture carefully
As a nonogram takes shape, it's tempting to complete a familiar-looking outline from appearance alone. Keep checking the numbers. An expected shape can lead you into a guess that the row and column clues don't support.
When the grid is finished, check the lengths, order, and separation of its runs. Then read whatever instructions accompany the image. What the picture contributes to the mystery depends on that context.
Carry the evidence into the case
Our planned Oddquiries books pair large-print nonograms with matching, timeline, and spatial-logic puzzles. The visual discoveries and deduction puzzles are intended to work together as part of the investigation. You'll need to consider the information the book provides and the relationships between its clues.
The winter series, Sno Much to Hide, includes A Very Merry Cover-Up, An Alibi with Baggage, and A Cold Show of Hands. All three are coming soon, with gradually increasing difficulty and hints and answers included in the books.
Until then, the essential nonogram habit is simple: find a mark you can explain. A single certain square gives you somewhere solid to begin.