Nonogram — medium (2025-10-20)

• Grid: 15×15
• Filled cells (solution): 103 / 225
• Fill density: 46%
• Longest row hint run: 6
• Longest column hint run: 5
• Average hint groups: rows 4.1 • cols 4.5

Medium Nonograms require more elimination and careful marking. With a 15×15 grid and ~46% filled density, expect to use X-marks to avoid mistakes and resolve overlaps.

• Use overlap + spacing: place a run at its earliest and latest positions and fill the intersection.
• Switch to X-marks aggressively once a line’s runs are placed to lock in empty cells.
• When stuck, pick one line and fully resolve it — Nonograms often unlock in cascades.

• Try today’s other difficulties: Easy · Hard
• Previous days (Medium): Sun, Oct 19 · Sat, Oct 18 · Fri, Oct 17 · Thu, Oct 16 · Wed, Oct 15 · Tue, Oct 14 · Mon, Oct 13

What do the numbers mean?

Each number shows a group of filled cells in that row or column. Multiple numbers mean multiple groups, separated by at least one blank cell.

Is X-mode required?

It’s optional, but it helps a lot. Marking definite blanks prevents accidental fills and makes deductions easier.

Do I need to guess?

No. These puzzles are designed to be solved logically using overlaps, spacing, and elimination.