No ads, no hidden costs, thousands of possible games, and every one a unique challenge!

Note: This version of Deduce supports iOS 13, but requires at least iOS 10.3 or later.

Deduce is a fun way to learn and visualize the process of logical deduction for players of all ages. It's a uniquely challenging brain game requiring clear thinking (and a small element of luck) played with six-letter words. Deduce a mystery word by exercising both your vocabulary/spelling skills and your ability to make logical inferences. The goal is to discover the mystery word with as few guesses as possible. Deduce acts as an assistant who enforces the rules, provides hints, keeps track of your progress, sets up match games, and awards achievements. No ads, no in-app purchases, just pure fun!

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. 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, Match, 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 is awarded for each achievement -- collect them all!

2. Online Matches will return in a future update. You may play a Deduce match race with an opponent, or challenge a friend by selecting his or her mystery word yourself. If you are not racing to deduce the same word, watch your opponent's game as it's played. Text chat during or after the match. Until this feature returns, you can challenge your friends by sharing a Deduce game number via Airdrop, email, or iMessage.

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.

4. Game records. Keep or mail beautifully formatted PDFs of your games or matches to yourself or others, or print your games using AirPrint.

5. Global settings. 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 particular game really challenging? Send it or airdrop it to nearby friends.

7. Improved user experience, improved marking and unmarking, and simpler game play. Use letter dials or a keyboard to enter your guesses. On an iPhone or iPod touch, pinch/spread the guess list to enlarge it for easier manipulation. On any device, swipe across the guess list to eliminate or restore guesses with no hits. Reorder your guesses at any time. Having trouble thinking of words? Use the Suggest button! Need advice about your game play? Tap on Sherlock for tips and encouragement.

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

What’s New

Version 3.8

Deduce 3.8—Now with Support for New iPad Pro’s & iPhone SE (Gen 2)!

Deduce 3.8 requires iOS 10.3 or later. It features the following improvements:

•Support for iOS 13
•User interface improvements targeting iPads plus iPhone X and later models
•Improved menus for iPadOS portrait orientation
•New “Smart Keyboard Cursor” - more intuitive staging area cursor movement
•Faster, smoother startup
•Better sharing support
•Two built-in game backgrounds
•An easier to use Novice mode, where the Suggest button may be used freely with no penalty to your score.
•New sorting features for arranging guesses and managing long lists of saved games
•Fixed some ambiguities in "Play a Specific Game" to correct a bug and simplify the input panel
•Many other subtle bug fixes

Some of you will be pleased to know that many older Apple devices are still supported including iPhone 5, iPad 2, iPad Mini 2, iPod Touch (5th Gen), etc.

A temporary restriction on the multiplayer feature is still in effect, but you can use the “Play a Specific Game” capability to manually challenge (or accept a challenge from) your friends in the meantime.

Deduce 1.0 was introduced on Jan 22, 2010.

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

    With Family Sharing set up, up to six family members can use this app.

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