GridWits
Easy tier Technique 9 of 31 Used by Smart Hint

No Single Edge

An untouched dot with only one possible edge cannot use it, because that would leave exactly one line at the dot.

How it works

  1. 1Three directions at the middle dot are already crossed out, and no line reaches it.
  2. 2Drawing the one remaining edge would leave the dot with exactly one line — a dead end, not part of a loop.
  3. 3Cross out the last edge too; this dot stays untouched.
  • Edge ruled out
  • Cells that establish the pattern
Next in the ladder Premature Loop →

If an edge would close a smaller loop while lines or clues remain outside it, that edge is an X.