Bulls & Cows

Haystack — Build, Play & Share

🧠 Daily Game 🐂 Bull Rush 🔁 Unlimited Play ⚔️ Multiplayer 🏆 Leaderboard 🧑‍🏫 For Teachers ℹ️ About

How it works

Pick a difficulty, generate a unique-solution puzzle (a set of Bulls & Cows clues), then play it right here. Share the puzzle link with friends, or reveal the answer if you’re teaching or stuck.

  • Easy: 4-digit code, 5 clues
  • Medium: 6-digit code, 7 clues
  • Hard: 7-digit code, 7 clues (large search space; we use a fast sampler)

Step 1 — Choose & Generate

Pick a difficulty and click Generate.

Clues

#GuessBullsCows
No clues yet.

Your Attempts

#GuessBullsCows
No attempts yet.

Step 2 — Play

After generating or opening a shared link, the clues appear below. Make guesses until you get all Bulls.

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