GridWits
Easy tier Technique 4 of 21 Smart Hint: Skyscrapers and Skyscrapers+

Full Visibility Clue

A clue equal to the grid size means every building is taller than the last — the whole line is forced into one exact order.

How it works

  1. 1The 4 on the top edge says all four buildings are visible down that column — every one must be taller than the last.
  2. 2Only one order does that: 1, 2, 3, 4 from the clue inward.
  3. 3The whole line is forced in a single stroke, starting with the 1 at the top.
2 3 4 4
  • Relationship — The arrow shows which cells support the deduction.
  • Conclusion — The final arrow lands beside the proved or ruled-out height.
Next in the ladder Visible-Count Bound →

At each position, leave enough taller heights behind to reach the clue's visible count — eliminate every height too tall to allow that.