Guide
How to Play Bulls and Cows
Bulls and Cows is a deduction game about finding a hidden set of unique digits within a limited number of attempts.
Each guess returns A/B feedback: A means a digit is correct and in the right position; B means a digit exists in the target but is in the wrong position.
What You Are Trying to Do
Find the exact four-digit answer. In the standard version, each digit is unique, so a guess like 1123 is not part of the normal rule set.
- A means the digit and position are both correct.
- B means the digit exists, but it is in another position.
- 0A0B means every digit in that guess can be removed.
Read A/B Feedback
A clue such as 1A2B means three digits from your guess are in the answer, and one of them is already in the right place. It does not tell you which three, so later guesses must test the possibilities.
Make Useful Opening Guesses
A good opening guess spreads information across four different digits. After that, choose guesses that separate possibilities instead of repeating the same uncertainty.
Use Marks to Narrow the Search
When you know a digit cannot appear, mark it as excluded. When you suspect a position, keep that note visible so later clues do not have to be remembered from scratch.
Finish Without Guessing Blindly
Before submitting the final answer, check it against every earlier clue. A correct solution must match the A/B result of every previous guess, not only the most recent one.