Logical Construct & Philosophy vs Think Again

Logical Construct is an educational puzzle app that makes formal logic genuinely playable. Instead of passively reading about reasoning, you actively construct valid proofs by applying the same inference rules used by logicians, mathematicians, and philosophers: Modus Ponens, Modus Tollens, Hypothetical Syllogism, Reductio ad Absurdum, and more. Each puzzle gives you a few premises and a target conclusion. Your job is to build a chain of deductions, one rule at a time, until you reach the conclusion. By doing the proofs yourself, not just reading about them, abstract logical concepts become concrete, intuitive skills. You'll progress through propositional logic, work with modal operators of necessity (□) and possibility (◇), and tackle advanced techniques like Conditional Proof and Reductio ad Absurdum. Classic philosophical arguments (the Paradox of Omnipotence, the Problem of Evil, Anselm's Ontological Argument, and Plantinga's modal version of it) become living frameworks for applying these principles. Reasoning that shaped two millennia of philosophy, now something you can practise on your phone. WHAT'S INSIDE • 20 levels, 60 puzzles, from your first Modus Ponens to S5 modal logic • 24 inference rules organised into six categories: conditional, conjunction, disjunction, negation, biconditional, and modal • Step-by-step solution viewer that reveals the proof one move at a time: it shows you the path, it doesn't solve it for you • Truth tables for every propositional rule, with the row where all premises are true highlighted so you can see why the rule is valid • Live formula highlighting that shows which lines a rule will use • Subproofs with Fitch-style indentation: the natural way to learn Conditional Proof and Reductio ad Absurdum • First-launch tutorial that walks you through your very first deduction, plus dedicated intros for subproofs and modal logic • Atom legend on every puzzle: tap to see what each symbol stands for and read the puzzle as a story in plain language • Neumorphic design with colour-coded rule categories • Progress tracking with automatic level unlocking WHO IT'S FOR Students strengthening their formal reasoning, philosophy enthusiasts curious about how arguments actually work, or anyone who enjoys a good puzzle that makes you think clearly. - Privacy Policy: https://sites.google.com/view/logicalconstructapp/accueil - Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Discover how you really think. ThinkAgain brings classic philosophical thought experiments to your pocket. Challenge your intuitions, uncover hidden biases, and compare your reasoning with thousands of others. EXPLORE TIMELESS QUESTIONS • Mary's Room: Can you learn something new from experience that no amount of facts could teach you? • Valid or Invalid: Test your logical reasoning with syllogisms that have stumped students for centuries. • Battleground God: Navigate a minefield of 17 statements about God and morality. Can you reach the end without contradicting yourself? • Philosophical Health Check: Examine 30 pairs of beliefs. How many tensions lurk in your worldview? • Carneades' Dilemma: Face an impossible choice at sea. What would you do when there's no right answer? • The Trolley Problem: Should you push the fatman? Four variations on philosophy's most infamous dilemma. • The Wason Selection Task: A deceptively simple logic puzzle that exposes how context shapes reasoning. • The Framing Effect: Watch your preferences flip based on how options are presented. • The Drowning Child: If you'd save a drowning child, why not donate to charity? Peter Singer's challenge. • Who Said It?: Match quotations to philosophers. Harder than it sounds. UNDERSTAND YOUR PATTERNS After each experiment, receive detailed analysis of your responses. Discover your: • Reasoning style and cognitive biases • Consistency across related questions • Performance compared to global averages • Tendency toward certain philosophical positions COMPARE WITH THOUSANDS See how your responses stack up: • Global statistics across all users • Breakdowns by age, education, and country • Real-time data updated as more people participate • Anonymous and privacy-focused UNLOCK DEEPER INSIGHTS Upgrade to Premium for: • Detailed demographic comparisons • Advanced pattern analysis • Unlimited access to all features • One-time purchase, no subscription DESIGNED FOR DISCOVERY • Beautiful, distraction-free interface • Clear explanations of philosophical concepts • No ads, no tracking, no algorithmic feeds • Works offline for experiments you've completed GROUNDED IN RESEARCH These aren't arbitrary questions. Each experiment is based on real philosophical thought experiments that have shaped debates in ethics, epistemology, logic, and metaphysics. ThinkAgain makes them accessible without dumbing them down. YOUR DATA STAYS YOURS • All results stored locally on your device • Optional anonymous sharing for statistics • Delete everything with one tap • No personal information collected Whether you're a philosophy student, a curious skeptic, or someone who enjoys a good mental workout, ThinkAgain offers a unique window into how you think—and how that compares to everyone else. Download now and start questioning your assumptions.