Dr. Number: Bulls and Cows

Dr. Number is a number-deduction puzzle — a code-breaking brain game reimagined with daily challenges, real-time duels, and global rankings. The game goes by many names: Bulls and Cows, Cows and Bulls, Hit and Blow, Number Baseball, 1A2B. The rules never change — crack the hidden number. HOW TO PLAY Guess the secret code. Each guess tells you how many digits are exactly right (right digit, right spot) and how many are close (right digit, wrong spot). Use logic to crack the code in as few tries as possible. THREE WAYS TO PLAY • Daily Challenge — Everyone in the world solves the same puzzle each day. Build your streak and share your results. • Single Play — Choose 3 or 4-digit codes, track your best records, and use pencil marks to narrow down the possibilities. • Versus — Jump into a quick match, or challenge a friend directly. Both players set a secret code and take turns guessing —…