# 1A2B — Bulls & Cows

> Daily logic deduction game

Canonical page: [https://chrome-stats.com/d/id6799002110](https://chrome-stats.com/d/id6799002110)

## Overview

- **ID:** `id6799002110`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Yu Te Lu
- **Category:** Puzzle
- **Version:** 1.0.1
- **Last updated:** 2026-09-01
- **First published:** 2026-08-27
- **Size:** 22 MB
- **Data as of:** 2026-09-08
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/1a2b-bulls-cows/id6799002110)
- **Website:** [https://123derder.github.io](https://123derder.github.io/)
- **Privacy policy:** [https://123derder.github.io/1A2B/privacy.html](https://123derder.github.io/1A2B/privacy.html)

## Description

The classic Bulls & Cows number game. Learn it in 30 seconds. A new puzzle every day, same for everyone — build your streak and challenge your friends!

Remember playing this with a pencil in the back of class? Each of you hides a secret number, trading guesses turn by turn — first to crack the other's code wins. That game now lives in your pocket.

The rules take 30 seconds: A = right digit, right spot; B = right digit, wrong spot. Use those two clues to crack the secret number in as few guesses as you can. Simple rules, pure deduction, minutes a round.

— DAILY CHALLENGE
One puzzle a day, the same for everyone worldwide. Build your streak and share your result with friends.

— 3 TO 10 DIGITS
Start easy with 3 digits or push your limits at 10. From casual to hardcore.

— PENCIL & PAPER TOOLS, BUILT IN
The best part of 1A2B has always been scribbling notes while you deduce — so we built it in:
• Digit marks: one tap crosses out digits you've ruled out, or circles the ones you know are in
• Position notes: jot candidate digits for every slot and narrow the answer down step by step
• Notes save automatically with each game — leave and pick up your deduction right where you were

— AND MORE
• Full guess history — see every step of your deduction
• Stats and win rate to track your progress
• Hand-drawn notebook feel, like deducing on real paper
• Fully playable offline — commutes, queues, bedtime

Ready? Today's number is waiting.

## Rankings

- #1,677,585 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6799002110)