- Size
- 15 × 15
- Time
- 00:00
- Checks
- 0
Paint the squares that must be filled.
15x15 Nonogram
Build the picture from several local proofs.
A 15×15 Nonogram is a picture logic puzzle. The clues beside each row and column describe filled runs in order, with at least one empty square between separate groups. Fill only cells supported by every legal placement and cross cells that no remaining group can reach.
This hard example is designed for about 16 minutes. It contains 45 row clue groups and 32 column clue groups, and the release solver completed it in 29 logical steps without using the hidden picture as evidence.
Work in passes: overlap long clues, close exact runs, inspect edge anchors, and exclude spaces too small for the remaining groups. Large grids reward complete follow-through after every mark.
Touch controls separate Fill, Cross, and Erase so each mark is deliberate. Check audits your current grid, Hint explains the next supported deduction, and local saving lets you return to the same 15×15 board without signing in.
Common questions
How long does a 15×15 Nonogram take?
This published example is estimated at about 16 minutes. Your time will vary with familiarity and how often you recheck completed lines.
What is the best way to start a 15×15 grid?
Work in passes: overlap long clues, close exact runs, inspect edge anchors, and exclude spaces too small for the remaining groups. Large grids reward complete follow-through after every mark.
What should I do when no line looks obvious?
Audit clue order and completed-run boundaries, then scan a different region. A distant cross can create the edge or segment the original line was missing.
Can this Nonogram be solved without guessing?
Yes. The published clue set was completed by the release solver in 29 supported steps without relying on the final picture.