GridWits
Extreme tier Technique 19 of 20 Used by Smart Hint

Agreement

Whichever of a cell's candidates turns out true, every surviving line of play forces the same digit onto some other cell — so commit it.

How it works

  1. 1Reading one run at a time is finished here — every run still fits its clue whichever way you fill it, so nothing more falls out.
  2. 2The top-left cell can still be 1, 2, 3 or 4, and all four survive when you play them through the columns and the bottom row.
  3. 3Each choice drives a different digit into the column beneath it, so no single branch settles anything on its own.
  4. 4All four nevertheless end with a 5 in the top-right cell. Place it, without ever finding out which branch was true.
7 9 14 10 1 2 3 4 1 2 3 4 5 6 20 3 4 5 6 5 6 7 8 8 9
  • Cells that establish the pattern
  • Where the conclusion lands
Next in the ladder Contradiction →

Placing this digit here forces some run into an impossible position — so it can be ruled out.