15×15 · Hard

Hard Nonogram puzzle

A larger grid for experienced solvers who enjoy a longer chain of deductions.

01

A deeper picture-logic challenge

Hard puzzles use a 15×15 grid with longer clue sequences and more interactions between rows and columns. The solution never requires guessing, but progress may depend on combining several small deductions.

02

Controls that support careful play

Drag to mark a run of cells, use crosses to protect known gaps, and undo the latest action when needed. On narrow screens the board scrolls in a controlled area without changing the puzzle.