Deduce 4+

A unique game of skill & logic

Obviously Genuine

Designed for iPad

    • $2.99



At last! Ever thought "wouldn't it be fun to play Deduce with 5 letter words?" Now all games may be played using 5 or 6 letter words! More than 20,000 unique games!

Deduce is a fun way to learn and visualize the process of logical deduction. It’s a uniquely challenging game combining logic, vocabulary, and spelling skills (with a small element of luck) played with words. Your goal is to discover a hidden mystery word with as few guesses as possible. Deduce acts as an assistant who enforces the rules, provides hints, keeps track of your progress, collects statistics, manages saved games, and (for Game Center users) awards achievements.

Reviewers have said:
"One of my favorite games", "Other games get installed-played-uninstalled, but this one stays", "Challenging and addictive", "Very original and lots of fun", "I'm completely hooked", "Hope I can stop playing it soon!"


1. Many thousands of possible games (more than 20,000)

2. Comfort level - Deduce can be as easy or challenging as you like, with optional features to assist your thinking. Play with easier 5 letter words or more difficult 6 letter words. NEVER ANY ADS TO DISTRACT YOU!

3. Game Center integration. Statistical results, scores, and saved games are associated with the active Game Center player. If you are not logged into Game Center, you may supply your own player name for separate game tracking, or play anonymously. If you use Game Center, scores are reported to Classic, Novice, and Puzzle leaderboards. A Champions leaderboard ranks the overall quality of your play over time. Achievements may be earned based on the quality and persistence of your game play. As you earn Deduce achievements discover 50 19th century literary giants of the western world, who were also masters with words. A portrait medallion, with a biography link, is awarded for each achievement -- collect them all!

3. Mystery Word definitions. When you finish a game of Deduce, a definition of the mystery word is provided. Increase your vocabulary as you play more games. Definitions come from’s Apple’s downloadable dictionaries or Wiktionary, whichever is available.

4. Game records. Save your games automatically or selectively. Create beautifully formatted PDFs of your games for sharing or printing.

5. Preferences. Use the Settings App to specify global options for Deduce, such as autosave (which automatically saves a limited or unlimited number of your completed games).

6. Easy sharing with friends or other devices. Find a game really challenging? You can challenge friends to find the same mystery word by sharing a Deduce game number via Airdrop, Messages, or email. Deduce also plays well on a shared device. Each family member can play using their own name or Game Center account with separate saved games, statistics, and (for Game Center users) achievements.

7. A polished user experience with improved marking and simpler game play. Use letter dials or a keyboard to enter your guesses. On an iPhone, enlarge guess list for easier manipulation. Reorder your guesses to see more potential patterns. Having trouble thinking of words? Use the Suggest button! Need advice about your game play? Tap on Sherlock for tips and encouragement. And check out the help info to learn about letter frequencies and common suffixes.

8. Select your favorite photo as a backdrop for playing Deduce, or use one of our two built-in backdrops.

What’s New

Version 4.0

Deduce 4.0 —The Most Challenging Word Game Gets Even Better!

• First time ever! Now play Deduce games with 5 or 6-letter words
• Another first: the ability to run Deduce on an M1 Mac
• Improved performance with reduced memory usage
• Support for different named users on a shared family device
• An improved Activity/Share sheet
• Revised Help information
• Many subtle bug fixes for improved reliability
• More than 20,000 unique games in one app!

This version of Deduce requires iOS/iPadOS 16 or later, and runs on M1 devices with macOS 13 or later

Deduce 1.0 was introduced on Jan 22, 2010.

Enjoy! And let us know if there are other features you would like to see in future releases. Email us with comments, suggestions, or bug reports at

Ratings and Reviews

4.7 out of 5
3 Ratings

3 Ratings

Barkley09 ,

A Fave...and excellent customer service!!

Yes, it's challenging, but it is far from impossible. One of my favorite games. The keyboard doesn't appear on my iPhone 4S. Not a deal breaker, just an FYI. Dials are easy enough to use. Voice recognition capabilities would rock so guesses could be entered simply by speaking. A fun thinking game!

UPDATE: Can I give a sixth star for amazing, personal response to a review?! Larry of Obviously Genuine (developer of this great game) contacted me to tell me how to access the keyboard on my iPhone 4S. Simply swipe to the left and the dials magically become a keyboard! (I've become that person I roll my eyes at...the person who complains about something without first reading the instructions! Egad.). Honestly, this was the first time I've ever had a developer personally respond to a review. Thanks, Larry! Top notch game AND service!!

Get the game, folks. Why are you still reading?! :)

Jargon MG ,

A new take on an old classic

A long time ago, in a galaxy far, far away, I used to spend hours playing Mastermind with my sister and anyone else who might be interested.. Those colored dots were both the source of agony and exhilaration..

The author of this application has taken that classic and breathed new life into it, using letters, rather than colored dots (although the background colors tend to remind me a lot of those dots).. I've owned this app since version 1.0, and the improvements are outstanding and show a lot of well-thought out efforts by the developer.

The latest version is no exception, and having the "floating tips" on the iPad app help focus your concentration when you're staring off into space wondering what 6 letter word to guess next.

I would give this app 5 stars, and do hope for continued success. I do have one request, which is to be able to skin the UI so that there are times I can escape my youth and not be so distracted by the colors.

Jerry Zeinfald ,

Fun, challenging, and educational.

I've been playing this game for quite a while now. Other games get installed-played-uninstalled, but this one stays on the device, outliving all of them.

The novice mode gets you well prepared for "classic" games, giving you a solid idea on how words in the English language are composed. Also, it will certainly expand your vocabulary, and the Dictionary feature is indispensable.

The gameplay is engaging. Ironclad logical deductions boost your self-esteem, while occasional lucky guesses bring you that "jackpot" sense :-)

App Privacy

The developer, Obviously Genuine, 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.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Game Center

    Challenge friends and check leaderboards and achievements.

  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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