Guess the 4 Numbers

Guess the 4-Digit Code in Minimal Attempts

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The secret number contains two identical digits.

Example patterns: 1228, 4407, 9391

The secret number contains three identical digits.

Example patterns: 7772, 3033, 1119

Probe widely first: Use diverse digits in early guesses to gather maximum information.
React to hints: “Double” ⇒ plan for exactly one pair; “Set” ⇒ test triples to find which digit repeats.
Eliminate aggressively: Track digits that cannot fit given the latest hint.
Optimize attempts: Each new guess should test the most uncertain positions or digits.

What does “Double” mean?

It means the secret number includes two identical digits (one pair).

What does “Set” mean?

It means the secret number includes three identical digits (a triple).

Are leading zeros allowed?

Yes. Numbers like 0073 or 0900 are valid four-digit guesses.