Snake Nonogram (20×20)
This is the Snake 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
- 196 of 400
- Longest run
- 18
- Typical time
- 45-90 min
- Category
- Animals
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How this board opens
A first sweep of the overlap rule down the rows and across the columns settles 223 of the 400 cells, about 56%, which is enough of a skeleton to work outwards from. The most generous opening is row 15, which gives up 16 cells on its own. 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 196 cells, and the longest unbroken run anywhere in the clues is 18.
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.
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