Frog Nonogram (20×20)
This is the Frog nonogram — a 20×20 picture logic puzzle. Use the number clues beside each row and column to work out which squares are filled, and the picture appears as you go. Every square can be deduced; you never have to guess.
About this puzzle
- Size
- 20×20
- Difficulty
- Normal
- Filled squares
- 182 of 400
- Longest run
- 16
- Typical time
- 45-90 min
- Category
- Animals
More puzzles like this
Need a hand?
How this board opens
A first sweep of the overlap rule down the rows and across the columns settles 237 of the 400 cells, about 59%, which is enough of a skeleton to work outwards from. The most generous opening is row 1, which gives up 20 cells on its own. 4 of the 40 lines are decided outright by their clues, with no room to slide. From there the board finishes on row-and-column logic alone — there is no point where you have to try a cell both ways and see which one breaks. The finished picture fills 182 cells, and the longest unbroken run anywhere in the clues is 16.
About this category
Animals spans the full range of grid sizes the catalog offers — a single 5×5 sketch, a scattering of 10×10 and 15×10 boards, and a run of larger 15×15 and 20×20 pieces for anyone who's outgrown the small stuff. That spread makes it the closest thing on the site to a proper learning path: start with the tiny one to get a feel for reading clues, work through the mid-size boards as your row/column cross-referencing improves, and finish on the 20×20s once 2×2 intersection reasoning stops feeling like a chore.
See all →