Game technique · Slitherlink
The 3 Clue in Slitherlink
A cell marked 3 needs exactly three of its four surrounding edges in the loop.
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A cell marked 3 needs exactly three of its four surrounding edges in the loop.
Example
If one edge is ruled out, draw the other three. If three are drawn, cross out the fourth.
Key point
A cell marked 3 needs exactly three of its four surrounding edges in the loop.