PLAYRADOX: Paradox Puzzles

Can Achilles ever catch a tortoise? Can a hotel with infinite rooms, all full, still fit one more guest? Is "this sentence is false" true or false?

PLAYRADOX turns 100 famous paradoxes, illusions and logic puzzles into quick, tricky levels. Tap, drag, wait or think sideways: the obvious answer is always wrong. Solve a level and you learn the real idea behind it, from Zeno and the Monty Hall problem to the Tower of Hanoi and Gödel.

10 CHAPTERS, 100 LEVELS
• Breaking the rules: puzzles that teach you to doubt the obvious
• Time and infinity: time loops, endless hotels and impossible stairs
• Real logic: liars, guards and probability that fools everyone
• Seeing is deceiving: illusions you can check for yourself
• Words that bite: riddles that mean exactly what they say
• Chance and choice: probability you can play with
• Things that move: physics that surprises
• Logic machines: river crossings, jugs, coins and switches
• Mind tricks: attention, memory and bias
• Forever and the end: infinity, proof, and a final twist

A NEW DAILY PARADOX
A fresh puzzle every day. Keep your streak going and share your result with friends.

LEADERBOARD
See how you compare with other players today and of all time. No account, no sign-up: you get a random name like "Sneaky Tortoise 42".

STUCK?
Every level has two hints. Each hint unlocks after a short video ad, and every level teaches you the trick once you solve it.

Free to play, with ads. Made for curious minds aged 13 and up.