20 by 20 nonograms
Twenty by twenty is a proper workout. On a phone, turn it sideways or use a tablet for bigger squares. Every grid on this page is made in your browser the moment you ask for it, then checked by a solver so it has exactly one answer.
Tips for this size
- Count with the heavy lines: every block of five is marked.
- Solve in passes: all rows, then all columns, then repeat.
- If nothing moves, compare the longest clue in a line with the space left around the squares you already know.
Practice grids are random patterns. For a real picture, play today's puzzle.