GridWits
Easy tier Technique 7 of 31 Used by Smart Hint

Dot Complete

Once two lines meet at a dot, every other edge touching that dot is an X.

How it works

  1. 1This dot already has two lines meeting at it.
  2. 2A loop can only pass through any dot once — degree 0 or 2, never more.
  3. 3Its other two edges are impossible now — mark them with an X.
  • Edge on the loop
  • Edge ruled out
  • Cells that establish the pattern
Next in the ladder Continue the Line →

One line reaches a dot and only one exit remains, so the line must continue through that exit.