Labyrinth of Probability

Labyrinth of Probability

Play the Monty Hall problem

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Free
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Released
April 8, 2026
Updated
October 27, 2026

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About

Trust your gut, and you lose. Think in probabilities, and you win. Labyrinth of Probability is a 9-room roguelike where you solve famous probability paradoxes with your own hands. You pick one of three doors. The guardian opens a losing door. Do you switch, or stay? Switch. Your odds go from 1/3 to 2/3. Every room is one paradox, and your answer is your odds. After each room you see the true odds of every choice and a short explanation. A run takes 2–3 minutes. No manual needed: you build an instinct for probability just by playing. SEVEN ROOMS - Monty Hall's Doors: switch or stay? - Penney's Coin Duel: see their coin pattern, then pick yours - The Scout's Report: a 90%-accurate scout says "weak point". Trust it? - The Birthday Horde: do any two of 23 monsters share a birthday? - Bertrand's Chests: you drew a gold coin. Is the other one gold too? - Simpson's Spring: the potion that wins overall, or the one that wins in every group? - The Two-Envelope Demon: "Swap and you get 1.25×." Do you pay? FATE STONES A stone is spent only when you miss, and gives you one more roll. A 50% shot becomes 75%. Choosing where to use them is the skill. THE LORD OF PROBABILITY Room 9 is three rounds against the Lord. The HP and stones you saved decide it. PATHS AND DOUBLE OR NOTHING After each room, choose the next one from two paths. The harsh path is a level harder and hurts more on a miss, but scores double. You can also bet a won room's points on a coin flip. DAILY LABYRINTH Every day, everyone faces the same rooms. Only your first run of the day goes on the leaderboard. NO SINGLE RIGHT ANSWER The guardian's nature, the length of the year, the numbers in the table: the right answer can flip. Memorizing won't do; thinking will. SMART CALLS AND LEADERBOARDS Every best choice earns a smart-call bonus. Compete for score and rank (S to D) on daily, weekly, monthly, and all-time online leaderboards, and share your result with one tap. Link your Apple ID or Google account to keep your records across device changes and reinstalls (unlink anytime). MASTER LABYRINTH (in-app purchase) Less HP, fewer stones, and every room one level harder. Scores count 1.5×, with its own leaderboard. Bad at math? Good. The more you trust your gut, the more this labyrinth will surprise you.
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What's New in Labyrinth of Probability

4.0.0

October 27, 2026

v4.0.0 — Rebuilt from the ground up - Seven probability paradoxes, now solved directly: open doors, pick coin patterns, and more, across nine rooms - After each room, see the true odds of every choice with a short explanation - New fate stones (a second roll, spent only on a miss) and a three-round finale against the Lord of Probability - Runs now take 2–3 minutes, and you can start playing right away; the nickname prompt comes after your first run - New Master Labyrinth mode (previous Chain Caster Build buyers get it unlocked automatically) - Leaderboards reset for the new scoring (Labyrinth / Master Labyrinth × all-time, daily, weekly, monthly) - Share your result - New players get short tips in their first room - Choose your next room from two paths after each room; the harsh path scores double - New double-or-nothing bet on a won room's points - New Daily Labyrinth: everyone gets the same rooms each day, with its own leaderboard - New room variants where the right answer flips (a spiteful guardian, a 100-day year, and more) - Quit a run anytime with the x at the top left of each room - Choose personalized ads from "Ad settings" on the title screen

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$1.99

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