Ready to put the Skyscraper into action? This page is designed for you to practice and master Skyscraper with positions from real Sudoku puzzles.
Every board above is a position from a real puzzle where the Skyscraper is the next step. Tap the candidates it removes (or select a cell and press the digit) and press Check. If you’re stuck, Show me gives the answer and Next puzzle loads another. Want to watch one first? Switch to Worked example.
Quick Reminder: What is a Skyscraper?
A skyscraper uses one digit and two rows (or two columns) where that digit has exactly two places. One end of each pair lines up in the same column (the base); the other two ends (the roof) don’t. One of the roof cells must hold the digit, so any cell that sees both roof cells can lose it.
Want a full step-by-step guide? Read the Skyscraper technique article
How to Practice
- For one digit, find two rows (or columns) where it has exactly two places, with one pair of ends in the same column (or row).
- Remove the digit from any cell that sees both of the other two ends.
- On the board, tap each of those candidates to remove it.
- Press Check. On your first try you see how many you found; on the second, the ones you missed get a dashed ring.
Start Practicing on Full Puzzles
Once you can find the Skyscraper on most boards without pressing Show me, take it into a full game. Expert puzzles are where this technique starts to come up, and the step-by-step solver will name the technique each time you get stuck.