Logic Puzzles
Test your deductive reasoning, lateral thinking, and problem-solving skills with our collection of logic puzzles and brain teasers.
The Two Doors Riddle
You face two doors, each guarded by a figure. One always tells the truth, the other always lies. One door leads to freedom. You get one question.
The Monty Hall Problem
Three doors: behind one is a prize. You pick a door, the host opens another revealing nothing. Should you switch? A probability puzzle that defies intuition.
Einstein's Riddle
Five houses, five nationalities, five pets, five drinks, five brands. Only 2% of people can solve this without help. Can you figure out who owns the fish?
The Bridge and Torch Problem
Four people must cross a bridge at night with one torch. The bridge holds two at a time. They walk at different speeds. What is the fastest crossing time?
The Pirate's Gold
Five pirates divide 100 gold coins. The most senior proposes a split, and they vote. If rejected, the proposer walks the plank. What should the captain propose?
The Farmer's Crossing
A farmer must transport a fox, a chicken, and grain across a river. The boat carries only one item besides the farmer. How does he do it safely?
The Blue-Eyed Islanders
On an island, 100 people have blue eyes and 100 have brown. No one knows their own eye color. A visitor makes an announcement. What happens next?
The Counterfeit Coin
You have 12 coins and a balance scale. One coin is counterfeit and a different weight. Find it in just three weighings and determine if it is heavier or lighter.
The Poisoned Wine
A king has 1,000 barrels of wine and 10 prisoners. One barrel is poisoned. Using the prisoners as testers, find the poisoned barrel with one round of testing.
The Impossible Chessboard
64 coins on a chessboard, a hidden key under one square. Your partner must deduce the key's location after you flip exactly one coin. How do you communicate?