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Skyscrapers

Expert (7×7)

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Play Expert Skyscrapers — ThePuzzleLabs

Try this Expert Skyscrapers puzzle on ThePuzzleLabs.

00:00
Classic
2
5
1
5
2
2
1
4
4
3
1
4
2
3
3
3
1
4
3

How to Play Skyscrapers

Rules

  • Fill every cell with a building height from 1 to 7.
  • Each row and column must contain each height exactly once.
  • Border clues tell you how many buildings are visible from that direction.
  • Taller buildings block the view of shorter ones behind them.

Key Deductions

  • A clue of 1 means the tallest building (7) is right at the edge.
  • A clue of 7 means the buildings go in ascending order (1, 2, 3…7).
  • No clue shown? That constraint is hidden — deduce it from other clues.

Controls

  • Click a cell, then tap a number to place it.
  • Use arrow keys to navigate between cells.
  • Press N for notes/pencil mode, B for buildings view.
  • Press H for a hint.

Solve This Puzzle?

This will fill in the complete solution. The puzzle will be marked as “solved with reveal” rather than self-solved.

About expert Skyscrapers (7×7)

Expert Skyscrapers uses a 7×7 grid with 49 cells, 28 border clue positions, and no given cells. With 14 to 20 visible clues, you need complex constraint chains that span multiple rows and columns simultaneously. A single clue rarely forces a placement on its own at this size.

The main technique is simultaneous clue analysis: combine constraints from 3 or 4 clues that share cells to eliminate impossible values. For example, if a top clue restricts column 3 to heights {5, 6, 7} in the first row, and a left clue restricts that same cell to {3, 5, 7}, the intersection tells you only 5 or 7 are possible. Pencil marks are essential for tracking these intersections.

When a candidate set reduces to one value anywhere, place it immediately and propagate the elimination through its row and column. Expert puzzles often have a critical “unlock” point where several chains converge and a burst of placements follows. Patience and systematic scanning are more productive than trying to see the whole board at once.