Mind Cipher vs 1A2B

Mind Cipher is a Mastermind-style code-breaking game — Bulls and Cows, Hit and Blow, played with colors — filed as a spy dossier. Crack the hidden color code from ink marks: a filled dot is exact, a ring is the right color in the wrong slot, a dash is not in the code. The marks never rely on color, and an optional Shape Marks setting gives every peg its own outline. Then open the Lie file. Exactly one report in the round is fake. The rest are true. Cross-check the reports, find the contradiction, and crack the code anyway. Classic cases teach the real marks: 240 cases from beginner to master. Lie cases run a matching 240 where one clue always lies. Today's Case is a new puzzle every day, with Top Secret lie days and a home-screen widget. Duel Mode is pass-and-play: one sets the code, the other breaks it. Notes sit on the board so you can mark eliminated and confirmed colors. Informants (hints) are recruited by closing cases. Every closed case ends with a stamped report you can share. No ads. No account. Free to start: Today's Case, Duel, Classic 1–40, and Lie 1–80. Pro is a one-time $2.99 unlock for the rest of both files, Free Play, and the custom editor. The app follows your language, or you can set it in Settings: English, 简体中文, 繁體中文, 日本語, 한국어, Español, العربية, Deutsch, Français, עברית, Português, Türkçe. Share your case with a friend. On iPhone, they can accept the challenge with App Clip, without installing the full app.

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. — PLAY THE SAME PUZZLE TOGETHER Share a game code or QR with friends and everyone gets the same secret number. Deduce on your own, then compare who cracked it in fewer guesses. Great for parties, classrooms and group chats. — 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.