Are these extreme slitherlink free to print?

Yes. Generate the puzzle above and print it with its answer, at no cost and with no sign-up.

Does every puzzle have one solution?

Yes. Every puzzle is generated and checked so the clues fix exactly one solution, verified before it prints. The answer is on the second page.

Can I make a Slitherlink book to sell on KDP?

Yes. The free tool makes one puzzle. The KDP Slitherlink maker generates hundreds of graded puzzles at any KDP trim, as a print-ready 300 DPI interior and solutions PDF.

Free printable

Extreme Slitherlink

An extreme Slitherlink is large and sparse. Whole regions carry no numbers at all, and the loop through them is fixed only by what it must do everywhere else.

Difficulty

Bigger boards with fewer numbers are harder. Every puzzle has one loop.

8×8 board. Join the dots into one closed loop so each number has exactly that many of its four sides on it.

Two pages: the puzzle and its answer. Every puzzle is proved to have exactly one loop by the same engine as our KDP studio.

Want the whole book?

This makes one puzzle. Sign up to turn it into a full Slitherlink book for Amazon KDP: hundreds of graded puzzles at any trim, as print-ready PDFs.

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Preview

The puzzle and its answer, as they print.

Slitherlink Extreme

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Slitherlink Extreme · Solution

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How to solve a slitherlink

Join the dots into one closed loop so every numbered cell has exactly that many of its four sides on the loop. Unnumbered cells can use any number of sides.

The method

1Start with the 0s and the 3s. A 0 means none of its four sides are used, so cross all four off. A 3 means three are, which is nearly as strong. Two 3s side by side always share their touching edge.
2Work the corners. A 1 in a corner cannot use either of the two sides on the board edge, so both are out. A 3 in a corner must use both of them.
3Remember every dot has 0 or 2 ends. The loop never stops and never branches, so a dot with one line coming in must have exactly one going out, and a dot with two is finished.
4Refuse the early loop. If closing a line would make a small ring while any other line is still loose, that closure is wrong. There is only one loop in the finished puzzle.

The one rule: One closed loop, no branches, no crossings, and every number counts the sides used around its own cell.
What the answer page shows: The finished loop is printed at the back.
How the grades differ: Harder grades are bigger boards with fewer numbers, so more of the loop comes from the degree rule than from the clues.
Good for: Solvers who like drawing a line more than filling a grid.

Making a whole Slitherlink book?

This page makes one puzzle. To publish a book on Amazon KDP, the KDP Slitherlink maker generates hundreds of graded puzzles at any trim, as a print-ready 300 DPI interior and solutions PDF.

More printable Slitherlink

See every printable Slitherlink

Questions

Are these extreme slitherlink free to print?: Yes. Generate the puzzle above and print it with its answer, at no cost and with no sign-up.
Does every puzzle have one solution?: Yes. Every puzzle is generated and checked so the clues fix exactly one solution, verified before it prints. The answer is on the second page.
Can I make a Slitherlink book to sell on KDP?: Yes. The free tool makes one puzzle. The KDP Slitherlink maker generates hundreds of graded puzzles at any KDP trim, as a print-ready 300 DPI interior and solutions PDF.