+3-1 : Crack the Code

Ranked 1v1 duels, live ELO and a global leaderboard. Share a link and duel a friend in seconds. Play as a guest, no signup needed. No ads, ever.

Your opponent picks a secret 4-digit code. You pick yours. First one to crack the other's code wins.

Every guess comes back as a score — nothing else. +2-1 means two of your digits are correct and in the right place, and one more is in the code but sitting in the wrong spot. That's all you get. The rest is deduction.

HOW IT WORKS

• Both codes are 4 digits, no digit repeats, no leading zero
• Guess, read the score, eliminate, repeat
• No luck, no hidden mechanics — the same information is available to both players, every single turn

RANKED 1v1 Get matched against a real opponent in seconds and play for ELO. Win in fewer guesses and you climb faster. Track your rating, your streak and your place on the global leaderboard.

PLAY WITH FRIENDS Share a link, your friend taps it, the duel starts. No account hunting, no friend codes. Add the people you enjoy playing and rematch them any time.

SOLO PRACTICE Play the bot whenever you want a game with no stakes and no waiting. It thinks like a strong human opponent, so beating it actually means something.

PUZZLE MODE Hand-built stages you clear in order, each one solvable by pure deduction from the clues in front of you. No bot, no timer, no analysis helper — just you and the logic.

BUILT-IN ANALYSIS In duels and solo practice, the keypad keeps score for you: digits your guesses have already proven to be in the code light up, digits you have ruled out go dark. It only ever states what your own guesses have logically forced — it never leaks the answer. On for everyone, no setting to fiddle with.

NO ADS Not one. No banners, no interstitials, no rewarded videos — for free players and premium players alike. Nothing interrupts a duel.

START IN ONE TAP Play as a guest immediately. No email, no signup wall. Save your progress with Apple or Google later, whenever you feel like it.

PREMIUM Free players get 5 online matches a day. Premium removes the daily limit — play as much as you want. Solo play, puzzles and the tutorial are always free and unlimited.

Premium is an auto-renewing subscription, available as $2.99 per week, $7.99 per month or $39.99 per year. Payment is charged to your Apple ID account at confirmation of purchase. The subscription renews automatically at the same price unless it is cancelled at least 24 hours before the end of the current period, and your account is charged for renewal within 24 hours before the period ends. You can manage or cancel your subscription in your App Store account settings after purchase.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://plus3minus1.lafon10.com/privacy

Simple rules. Very hard to master. Crack the code.