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Nonogram

Hard

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Play Hard Nonogram — ThePuzzleLabs

Try this Hard Nonogram puzzle on ThePuzzleLabs.

00:00
Classic
35
331
212
521
44
1311
115
41
132
212
31
81
2211
9
112
332
51
26
1112
2121

How to Play — Nonogram

Goal

Fill cells to reveal a hidden pattern. Numbers along each row and column indicate consecutive groups of filled cells.

Clues

A clue like 3 1 means there is a group of 3 filled cells, then at least one empty cell, then 1 filled cell.

Controls

  • Click — Fill or clear a cell (in fill mode)
  • Right-click — Mark a cell with × (definitely empty)
  • T — Toggle between fill and ×-mark mode
  • Arrow keys — Navigate the grid
  • Space / Enter — Fill selected cell
  • X — Mark selected cell with ×
  • U / Ctrl+Z — Undo
  • R — Reset puzzle
  • H — Use a hint

Tips

  • Start with rows/columns where the clue fills most of the line.
  • Use the overlap technique: the region where a group MUST be, regardless of position.
  • Completed clues are automatically struck through.

Reveal Solution?

This will show the complete solution. The puzzle will be marked as "solved with reveal" rather than self-solved.

About hard nonograms

Hard nonograms are 10×10 grids with 45–65% fill and up to 5 clue groups per line. The grid size is the same as medium's upper range, but lower fill percentages and denser clues mean overlap gives you less for free. You need to work harder for each deduction.

Gap analysis becomes your primary tool. Once some cells are filled and some marked X, the line fragments into segments. Check each segment: can it fit the next unplaced group? If a segment is shorter than the group, it must be entirely empty. If it exactly matches, the group goes there.

Cross-referencing between rows and columns is also required consistently. Hard puzzles rarely resolve from row analysis alone — you need to alternate between rows and columns, using each pass's results to fuel the next.

If you get stuck, use the hint system — it'll point you to a deducible cell and explain the reasoning. Moving to expert means larger grids and multi-step deductions. Master cross-referencing here first.