AVOID LOOP

 

Avoid Loop

One of the possible diagonals in the highlighted cell would create a loop which is not permitted in Gokigen puzzles. The other diagonal must therefore be inserted. Note that in larger more complex puzzles, the loop to be avoided may be much longer than the one shown here, and could extend over a significant portion of the area of the puzzle.

The second graphic shows the situation after this hint has been acted upon. This incidentally completes the solution of this puzzle.