+3-1 : Crack the Code
Multiplayer number puzzle
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
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.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Lafonten Finansal Yazilim Limited Sirketi, 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 Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Lafonten Finansal Yazilim Limited Sirketi
- Size
- 50.1 MB
- Category
- Puzzle
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPad
Requires iPadOS 15.1 or later. - iPod touch
Requires iOS 15.1 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.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Infrequent
Contests
- In-App Purchases
Yes
- Weekly Unlimited $2.99
- Annual Unlimited $39.99
- Monthly Unlimited $7.99
- Copyright
- © 2026 Lafonten