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I propose the following tough Slitherlink puzzle.
(Source: Simon Tatham's Collection)
.---------------------------------------.
| . . . . . . . . . . |
9 | 3 3 3 3 2 2 3 |
| . . . . . . . . . . |
8 | 3 2 1 |
| . . . . . . . . . . |
7 | 3 |
| . . . . . . . . . . |
6 | 2 2 2 |
| . . . . . . . . . . |
5 | 3 2 3 3 3 |
| . . . . . . . . . . |
4 | 2 1 2 0 |
| . . . . . . . . . . |
3 | 2 2 2 2 2 3 |
| . . . . . . . . . . |
2 | 2 2 2 |
| . . . . . . . . . . |
1 | 3 3 2 3 2 3 |
| . . . . . . . . . . |
'---------------------------------------'
a b c d e f g h i Slitherlink
Update 1 (Sept 21, 2026)
Step 1: 32 basic moves
We have in this puzzle many well-known patterns such as:
(a)
.--------------- .---------------
| . . . . | .___. . .
| 3 | | 3
| . . . . => | . . . .
| |
| . . . . | . . . .
(b)
. . . . . . . . . .
x
. . . . . => . x .___. . .
3 | 3
. . . . . . . . . .
3 3 |
. . . . . . . .___. x .
x
. . . . . . . . . .
(c)
. . . . . . . . . .
. . . . . . .___. . .
3 3
. . . . . => . x .___. x . .
3 3
. . . . . . .___. . .
. . . . . . . . . .
After 32 moves we get the following:
.---------------------------------------.
| .___. .___. .___. .___.___.___. |
9 | | 3 | 3 | 3 | | 3 | 2 | 2 3 | |
| . .___. . . . . .___.___. |
8 | | | 3 | 2 | 1 |
| . . . . . .___. . . . |
7 | 3 |
| . . . . . . . . . . |
6 | 2 2 2 |
| . . . . . . . . . . |
5 | 3 2 3 | 3 | | 3 |
| . . . . .___. .___. x .___. |
4 | 2 1 2 x 0 x |
| . . . . . . . . x .___. |
3 | 2 2 2 2 2 | 3 |
| . . . . . . . . . . |
2 | 2 2 2 |
| . . . . . . . . . . |
1 | 3 3 2 3 2 3 | |
| . . . . . . . . .___. |
'---------------------------------------'
a b c d e f g h i SL
How to continue ?
Created: February 12, 2024
Contact: sudo.jco.br@gmail.com