# Logic Islands: Deduction Game — Daily brain & mystery puzzles > Handcrafted deduction puzzles based on truth-tellers and liars, with daily challenges. (iPhone/iPad app by Logic Islands.) - Source: https://appshunter.io/ios/app/logic-islands-deduction-game/id6760209096 (this page in markdown: same URL + `.md`) - Developer: [Logic Islands](https://appshunter.io/developer/1883218990) - Category: Games, Education, Puzzle - Price: Free with in-app purchases - Rating: 5.00/5 from 13 App Store ratings · 5 written reviews indexed - Age rating: 9+ - Requires: iOS 15.1 · 203 MB - Languages: American English - Released: 2026-06-21 - Data updated: 2026-08-24 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/logic-islands-deduction-game/id6760209096/reviews.md ## What is Logic Islands? Logic Islands is a world of handcrafted deduction puzzles, built by a mathematician and a neuroscientist for people who like a real problem. Not logic grids. Not another Sudoku clone. Not pattern-matching dressed up as a brain game. These are original deduction puzzles in the tradition of Raymond Smullyan's knights and knaves logical puzzles: islanders who can only tell the truth or only lie, and your job is to work out who is who from what they say. From there it gets stranger. You reason about what characters know, what they could have said, what the truth would have to be, and what questions you must ask. Every puzzle is made by hand by a mathematician who has spent over a decade inventing them. No AI, not now, not ever. Each one was tested on hundreds of real people and refined until it was exactly hard enough, the progression exactly right. All explanations are handwritten too. Ten islands, each with its own logic You begin on the island of truth-tellers and liars. Beyond it lie nine more, each with its own residents, its own rules, and its own way of bending the truth. Enter a gallery of deceit, weigh the reliability of up to eight witnesses to a single crime, and learn to ask the right questions of the right people, in the right order. The rules are taught through play, the difficulty climbs toward the genuinely mind-bending, and new islands keep arriving. A fresh trio every day Three new puzzles land each morning, separate from the island puzzles: a warmup, a challenge, and a master. Small enough to fit in a coffee break, but stimulating enough to stay with you all day. Keep your streak alive and climb the weekly and all-time leaderboards against everyone solving the same set. Help at every step, never just the answer Being stuck is part of it, but you are never stranded. Professor Logic gives a targeted nudge when you want one and a refresher on the idea in play. Once you solve a puzzle, he walks you through exactly why the answer holds. You come away understanding how to reason your way through even the most complicated problems. Real reasoning, in the shape of a game The skills here are the genuine article: the deductive reasoning used in mathematics and proof, relied on by anyone who has to think clearly under pressure, and tested on the LSAT and GRE. Propositional logic, knights and knaves, strategic questioning, reasoning about what others know, possibility and necessity, and more exotic logics. You'll learn to read AND, OR, XOR, IF-THEN, NOT, and a great deal more, as fluently as you read English. You will not feel like you are studying. You will just get sharper. Who it's for Puzzle solvers who have run out of things that truly challenge them. People who want more depth from their games. Anyone who loves paradoxes, proofs, or that satisfying moment when one detail forces every other piece into place. People who like a good argument and take pride in thinking things through. Mathematical, philosophical, and computing minds. Anyone preparing for the LSAT or GRE, or just looking to improve their logical reasoning skills. And anyone who misses the feeling of working something out entirely on their own, and wants to protect that. Logic Islands is free to download. You get the first island and your first five days of daily trios free, no account required, no ads. When you want the rest, Logic Islands Pro opens every island, every daily puzzle, and every island still to come, plus personal analytics. Think again. Questions, feedback: hello@logicislands.com Report a bug: support@logicislands.com. Press: press@logicislands.com. Subscriptions auto-renew unless cancelled at least 24 hours before the end of the period. Manage in your Apple ID settings. Restore Purchases is available in the profile settings. Terms of Use: https://logicislands.com/terms Privacy Policy: https://logicislands.com/privacy FOLLOW US: https://x.com/LogicIslandsApp ## Key features - Original deduction puzzles - Island-based logic challenges - Daily new puzzles - Leaderboards and streaks - Step-by-step hints and explanations - Learn propositional logic ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Logic Islands Pro Monthly | $9.00 | per month | | Logic Islands Pro Yearly | $60.00 | per year | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Logic Islands Pro Lifetime | $99.00 | one-time | ## Recent user reviews (5 of 5) All indexed reviews: https://appshunter.io/ios/app/logic-islands-deduction-game/id6760209096/reviews.md ### 5/5 — High production value, amusing puzzles *2026-07-18* As the title says! Great UI, I like the art style, the puzzles have been interesting and natural, and specifically the puzzle solving interface is very nice to work with. Good stuff! I hope some of the later puzzles have the state of the islanders indeterminate from their statements, or the possibility that one of them misspoke or something like this. Don’t want to implicitly train in the assumption that there is a determined solution! ### 5/5 — A brilliant workout for your brain *2026-06-28* I go to the gym and keep my body in good shape, but it never occurred to me to do the same thing for my brain. But I get the same feeling afterwards-I can literally feel my brain working better when I play Logic Islands, compared to when I haven’t played in a few days. I don’t have any particular background or interest in “logic,” but this is as fun as any game I’ve played, while being the opposite of brain-rot games that people otherwise waste time playing. Logic Islands would be worth it as 10x the cost - it’s the best thing on my phone behind actual phone calls and texting. Maintain your brain! ### 5/5 — Very smart!! *2026-06-28* This really makes you think. Well done!! ### 5/5 — Good daily mind training app *2026-06-26* I’m always looking for a way to train my mind, and this app is it! The explanations are well crafted and hints well placed when I hit a wall. Highly recommend! ### 5/5 — goated logic game *2026-06-25* hands down the best logic puzzle game i've ever played. lots of deep, challenging content that actually taught me a few things, and you can play without an internet connection 🥹 perfect for travel and daily brain training ## Frequently asked questions about Logic Islands ### What kind of puzzles does Logic Islands offer? Logic Islands features original handcrafted deduction puzzles, inspired by Raymond Smullyan's knights and knaves logic. These puzzles involve islanders who either always tell the truth or always lie, requiring players to deduce who is who based on their statements. ### Is Logic Islands suitable for younger players? Logic Islands has an age rating of 9+, making it appropriate for children and adults. The game's puzzles are designed to be challenging yet understandable, with helpful guidance available. ### Can I play Logic Islands offline? The description does not specify if Logic Islands can be played offline. However, the mention of daily puzzles and leaderboards suggests that an internet connection may be required for full functionality. ### How often are new puzzles added to Logic Islands? Logic Islands adds a fresh trio of puzzles every morning, including a warmup, a challenge, and a master puzzle. These are separate from the main island puzzles. ### Does Logic Islands have ads? No, Logic Islands does not contain advertisements. The app is free to download and play, with optional in-app purchases available for additional content or features. ### What are the subscription options for Logic Islands? Logic Islands offers two subscription plans: Logic Islands Pro Monthly for $9.00 and Logic Islands Pro Yearly for $60.00. These subscriptions likely unlock premium features or content. ### How does Logic Islands help players improve their reasoning skills? The game provides targeted nudges and explanations from 'Professor Logic' when players are stuck or after solving a puzzle. This helps players understand the underlying reasoning principles, including propositional logic, strategic questioning, and reasoning about knowledge. ### What makes Logic Islands different from other logic games like Sudoku? Logic Islands focuses on original deduction puzzles, not simple logic grids or Sudoku clones. It emphasizes reasoning about characters' knowledge and statements, similar to philosophical logic puzzles, rather than just numerical or pattern matching. ## Version history (last 2 releases) ### 1.0.1 — 2026-07-02 Daily puzzles now count toward your leaderboard standing, plus recovery for returning players and stability improvements across the app, and there is a fresh round of fixes and polish throughout. ### 1.0.0 — 2026-06-21 No release notes. --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*