Sudoku Tips: Hidden Pair Explained (Step-by-Step Guide)

Feel like you're scanning the grid but not making progress?

You might be overlooking a powerful but subtle technique: Hidden Pair.

Unlike Naked Pair, this one isn’t obvious — but once you learn how to spot it, your solving skills will level up quickly.

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What is a Hidden Pair?

A Hidden Pair occurs when:

• Two numbers appear only in the same two cells
• Within a row, column, or 3×3 box
• Even if those cells contain other candidates

Example:

• Cell A → (2, 5, 7)
• Cell B → (2, 6, 7)

If 2 and 7 only appear in these two cells, then:

👉 They form a Hidden Pair.

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Why is Hidden Pair Important?

Because it allows you to remove extra candidates from those cells.

Even though the cells have more numbers, the pair is “hidden” inside.

So:

• Cell A → becomes (2, 7)
• Cell B → becomes (2, 7)

👉 This simplifies the puzzle and often reveals new opportunities.

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Easy Example

Imagine a column like this:

Cell	Candidates
A	2, 5, 7
B	1, 3
C	2, 6, 7
D	4, 8

Step 1: Look at number distribution

Check where 2 and 7 appear in the column.

• 2 → only in A and C
• 7 → only in A and C

👉 That’s your Hidden Pair.

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Step 2: Eliminate other candidates

Remove all other numbers from those cells:

• Cell A → (2, 7)
• Cell C → (2, 7)

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Step 3: Continue solving

Now that the cells are simplified, other techniques may apply.

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Hidden Pair vs Naked Pair

This is where many players get confused:

Technique	What you look for
Naked Pair	Two cells with exactly the same 2 candidates
Hidden Pair	Two numbers that only appear in the same 2 cells

👉 Naked Pair looks at cells
👉 Hidden Pair looks at numbers

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How to Spot Hidden Pairs Faster

• Scan a unit (row/column/box)
• Pick a number and see where it appears
• Repeat with another number
• Look for two numbers sharing the same two cells

💡 Pro tip: This is easier when the puzzle is partially filled.

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Common Mistakes

❌ Mistake 1: Not checking all candidates

Hidden Pairs are easy to miss because they are not obvious.

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❌ Mistake 2: Confusing with Naked Pair

Remember: Hidden Pair is about number positions, not cell contents.

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❌ Mistake 3: Not removing extra numbers

Once found, you must eliminate other candidates from those cells.

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Practice This Technique

To master Hidden Pair:

• Look at rows or columns with many candidates
• Track where specific numbers appear
• Try to find overlaps

If you're unsure, using a Hint feature can help you recognize when this pattern appears.

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When Should You Use Hidden Pair?

Use it when:

• The puzzle feels stuck after basic techniques
• You see many cells with 3+ candidates
• No Naked Pairs are visible

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Final Thoughts

Hidden Pair is a key step toward becoming an intermediate Sudoku player.

It trains you to think differently — not just about cells, but about number distribution.

Once you master it, you'll start seeing structure in puzzles that once felt random.