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Skyscrapers

Einstein (7×7)

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Play Einstein Skyscrapers — ThePuzzleLabs

Try this Einstein Skyscrapers puzzle on ThePuzzleLabs.

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

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 Einstein Skyscrapers (7×7)

Einstein Skyscrapers is the hardest level: a 7×7 grid with only 10 to 16 of 28 border clues visible. Every puzzle at this level is certified solvable through constraint propagation alone. No trial-and-error, no backtracking. Each step forward can be deduced from the current board state using visibility reasoning and Latin-square elimination.

That certification is not just a label. Our generator verifies that pure propagation (naked singles, hidden singles, and line-based visibility analysis) fills every cell without ever needing to guess. If you find yourself wanting to try a value and see what happens, step back, because a logical deduction exists that you have not spotted yet.

The fewer visible clues make each constraint more valuable. Extract every bit of information from each clue. Cross-reference opposing clues on rows and columns that share cells. Track candidates meticulously using pencil marks. Einstein Skyscrapers rewards thorough, methodical solving over speed. Also see the hardest puzzles page for more einstein-level challenges across all puzzle types.