Slitherlink Help
Rules / Objectives Summary
- Join the dots to create a single continuous loop.
- The numbers indicate how many of the four surrounding sections contain a line.
- The loop never crosses itself and any given dot can only have a maximum of two lines passing through it.
See the Starting Techniques and Walkthrough below for extra tips and tricks.
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What are the numbers for?
These tell you how many lines surround that square.
Move your mouse over the puzzle to see the answer.
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Starting Techniques
- A 0 clue means that there is no loop around this square, and we can mark all of the edges with crosses.
- A 3 and a 0 together. As we have a zero, this cannot be a line, and the other three must be, and the loop carries on both sides.
- Two 3's together. No matter where loop goes, these will always be lines.
- Two 3's diagonally. No matter where loop goes, these will always be lines.
- A 3 and a 0 diagonally. No matter where loop goes, these will always be lines.
- 3 in a corner. No matter where loop goes, these two will always be lines.
- 2 in a corner. No matter where loop goes, these two will always be lines.
- 1 in a corner. No matter where loop goes, these cannot be lines.
- There are a number of other more advanced ideas that can be seen on Wikipedia.
Walkthrough
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Step 1
This is the start of the puzzle.
Solve this puzzle for yourself at the same time.
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Step 2
These 0 clues mean that there are no lines surrounding these squares, so we can mark them with crosses.
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Step 3
There is only one way of having 3 lines around this square, as we already have a cross along the bottom.
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Step 4
There are now only remaining 2 places for the loop to go for this 2 clue.
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Step 5
This is the only route allowed for the loop, to avoid the crosses we have.
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Step 6
There are now some crosses we can add, either because we've satisfied a clue, or a line would create a loop that's not allowed.
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Step 7
We have to satisfy the 2 clue, and this creates some crosses and the loop must go this way.
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Step 8
The loop must go this way to satisfy the 2 clue, which completes the 1 clue as it passes.
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Step 9
The loop must go this way to satisfy the 2 clue, which adds crosses and the loop continues around the bottom.
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Step 10
This is the only route for the loop, remembering to add crosses as we go, and the puzzle completes.
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Step 11
The completed puzzle.
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