Dr. Number: Bulls and Cows

Daily code puzzle & rankings

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

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 — first to crack it wins. Climb the ranked leaderboard. FEATURES • Global daily rankings and versus leaderboards (Elo-based) • Invite friends with a code or QR link for private matches • Pencil marks (memo) to track possible digits like a notebook • Unlockable color themes and avatars • 10 languages supported YOU WILL LIKE THIS IF YOU ENJOY • Number guessing games and logic puzzles • Brain games and mental workouts, the way sudoku is • Quick single rounds that fit into a short break • Head-to-head puzzle duels against friends No reading required — the rules click in seconds, and the logic keeps you coming back. Start Dr. Number today and climb the Bulls and Cows leaderboard!

Ratings & Reviews

  • 5.0
    out of 5
    1 Ratings

• Items now work in matches against real players. Hints, eliminations and position checks behave exactly as they do in practice matches. • Matches no longer stall. A round judged by only one side can't leave the game hanging any more. • Fixed sound not coming back after watching an ad. • Reworked the match flow for a steadier experience from matchmaking through to the result screen. • Corrected home screen layout and alignment. • Various bug fixes and stability improvements.

Version 1.2

The developer, 4tune3, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Linked to You

    The following data may be collected and linked to your identity:

    • Purchases
    • Contact Info
    • Identifiers

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Identifiers
    • Usage Data
    • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
4tune3 Co.,Ltd.
Size
34.5 MB
Category
Puzzle
Compatibility
Requires iOS 15.0 or later.
  • iPhone
    Requires iOS 15.0 or later.
  • iPad
    Requires iPadOS 15.0 or later.
  • iPod touch
    Requires iOS 15.0 or later.
  • Mac
    Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
English
Age Rating
13+
In-App Purchases
Yes
  • Pro Pack $9.99
  • Standard Pack $3.99
  • Mini Pack $1.99
  • Starter Pack $0.99
  • Berry Theme $0.99
  • Forest Theme $0.99
  • Remove Ads $2.99
  • Learn More
Copyright
© 2026 4tune3 Co., Ltd.
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