Nonogram 20×20Take on the biggest pictures
20×20 is 400 squares: the biggest nonogram (Oekaki Logic) in this game, with pictures drawn down to the fine detail. Of its 30 puzzles, the first 3 are free, with no sign-up, in the browser on a phone or a computer.
Who it's forThose who breeze through 15×15, when you want to take your time over one picture.
- Grid20×20 (400 squares)
- Time per puzzle20-40 minutes
- Puzzles30
- FreeFirst 3
1How to solve 20×20
- In a line of 20 squares, a "13" always covers the middle 6 squares. First go through all the rows and columns with big numbers and fill the overlaps.
- A line with lots of numbers is easiest to settle when its numbers and gaps come close to 20. Start there.
- The more squares you fill and mark, the more other lines settle. If you stall, count again, dividing the grid by the thick lines every 5 squares.
The rules and how to read the numbers, with pictures, are in How to play nonograms and tips.
2How the sizes differ
Difficulty has 5 levels, set by the grid size and how many times you have to go over the lines. 20×20 pictures are big ones at difficulty 4-5. 4 needs few passes; 5 is a tough one that gives up a square at a time.
| Size | Difficulty | Time per puzzle | Puzzles |
|---|---|---|---|
| 5×525 squares | 1 | 1-2 minutes | 74all free |
| 10×10100 squares | 2, 3 | 3-6 minutes | 160first 30 free |
| 15×15225 squares | 4, 5 | 7-15 minutes | 164first 30 free |
| 20×20400 squares | 4, 5 | 20-40 minutes | 30first 3 free |
3How to play
The puzzles on the 20×20 road run easier first. The first one you have not solved and the next 2 are open. The first 3 are free. After that, one ticket opens the next 1 on this road, or the Lounge Pass opens them all.
Pictures you solve go into their chapter's album. A picture keeps its name a secret until you solve it. In "Today's puzzle" (15×15), which changes at 0:00 every day, you race everyone's times.
420×20 questions
How many 20×20 puzzles are there?
30 puzzles, all pictures. The first 3 are free. After that, one ticket opens the next one, or the Lounge Pass opens them all.
How long does a puzzle take?
About 20-40 minutes. The ★ target time is 7 minutes at difficulty 4 and 10 minutes at difficulty 5.
Can I print them and solve on paper?
The 3 free puzzles print large on A4. Print one at a time and page 2 is the answer.
Is there only one answer?
Yes. Every puzzle has been checked: working from the numbers one line at a time leads to one picture, with no guessing.