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Hidden Single

Beginner

A number that can only go in one cell within a row, column, or box

💡 How to spot it: Scan each row, column, or box and ask: 'Where can this number go?' If only one cell works, that's a hidden single!
Puzzle 1 of 5

Other Techniques:

🎯 Naked Single 👯 Naked Pair 🔮 Hidden Pair ➡️ Pointing Pair 📦 Box/Line

More ways to play:

🏆 Daily Tournament 💣 Time Bomb 🎮 Classic Mode