Nonogram 15x15 puzzles for a longer solve

Nonogram 15x15 grids have 225 cells and up to seven runs per line, a solid half-hour of line logic for most players. Every grid is verified solvable without guessing. No app, no sign-up and no interstitial before you start; it works offline and every cell can be filled or crossed from the keyboard.

How to play a 15×15 nonogram

1. Clues give the runs of filled cells in each line, in order, separated by gaps.
2. Fill proven cells and cross proven blanks; use drag to mark long runs in one stroke.
3. Right-click places the other mark, and tapping a marked cell clears it.
4. On a phone, use the Scroll toggle to move the board without painting.
5. Finish when every clue is satisfied; crosses left on the board do not matter.

Nonogram 15x15 techniques

On 15×15 the clues are longer and the first pass leaves more gaps. Solving well is about organisation as much as logic.

Do the arithmetic first

For every line, add the runs and the gaps between them and subtract from 15. That slack tells you where overlap works: any run longer than the slack fills cells. A clue of 5 4 3 needs 14 cells, leaving 1 slack, so almost the whole line is set. Mark these before anything else.

Anchor runs at the edges and at crosses

A filled cell next to a border or a cross is the start of a run, so the run's full length follows. A crossed cell splits a line into shorter sections; if a run cannot fit in a section, the whole section is empty.

Match runs to their fills

When a line has several runs, ask which run each filled cell can belong to. A fill in the first third of the line usually belongs to one of the first runs, which limits where the others can go. The hint calls the result Forced fill or Forced empty.

Keep track of finished lines

Clues dim when a line matches, and with Highlight helpers on the row and column of the focused cell are tinted, which helps on a big board.

Daily, stats and printables

This page plays random 15×15 grids up to 600 px wide. The daily Nonogram uses the same size.

The timer starts on your first stroke and pauses when you switch tabs. Stats per size stay in this browser: played, won, win rate, best and average time. Undo and Redo cover every stroke. The first two hints on a puzzle are free; if ads are switched on later, more hints offer a short ad or a 30-second wait. Wins come with share text, and random puzzles have a code such as A7K3Q that replays them.

Plays anywhere, no app, no account

The 15×15 nonogram keeps cells at least 20 px and scrolls sideways inside its frame on a phone, with a Scroll toggle for one-finger panning. Tidy Puzzles runs entirely in your browser: there is no app to install, no account to create and no interstitial before you can play. After the first visit the game also works offline, because each puzzle is generated on your device from a seed. Every board can be played with the keyboard alone, on a phone or a desktop, and your stats and unfinished puzzles stay in this browser rather than on a server.