Contents of Key to solution for Slither Link

Key to solution for Slither Link

General rules


How to draw a line out of a corner of "3" when two lines are already connected in L-shape


When two edges already have lines in L-shape like this figure, let's think about the vertex placed diagonally from the L-shape edges.


Since a line must come to the vertex marked with star, either from the top or the left, it must extend either of the remaining edges (right or bottom).

Drawing a line out of a corner of "3" when two lines are already connected in L-shape

This is the opposite of the rule of drawing line to a corner of "3".

This is not so useful by itself, but is very helpful in a case like this:

By this rule, the outside two edges of diagonal "1" will be marked with "x".

It may not surprising when you only look at this result. But marking with "x" means it has made progress toward solution. Sometimes an "x" gives a lot of clues for solution.


Contents of Key to solution for Slither Link