Riddles & Brain Teasers

The Labyrinth of Logic

Nine intricate scenarios where only systematic deduction reveals the single valid answer.

#brain teasers#critical thinking#hard riddles#deductive reasoning#logic challenge#problem-solving#mind puzzle#2026#analytical puzzles

Quiz Intelligence

Total Questions

Difficulty Level

hard

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0/0

Quiz Questions

Answer all questions below and test your knowledge.

1
Five friends—Alex, Blake, Casey, Drew, and Evan—finished a race in different places from 1st to 5th. Alex finished two places ahead of Blake. Casey finished immediately behind Drew. Evan did not finish last. Blake did not finish first. Who finished second?
Question 1
2
A safe has a 10-digit code. The code uses only digits 0-9, each exactly once. The first digit is divisible by 1. The first two digits form a number divisible by 2. The first three form a number divisible by 3, and so on until all ten digits form a number divisible by 10. What is the fifth digit of this code?
Question 2
3
You are in a room with three light switches, each controlling one of three identical light bulbs in an adjacent room you cannot see into. You can turn switches on/off as much as you want, but you may enter the adjacent room only once to observe the bulbs. How can you determine which switch controls which bulb?
Question 3
4
Four cards lie on a table, each with a letter on one side and a number on the other. The visible sides show: A, B, 2, 3. The rule is: If a card has a vowel on one side, then it must have an even number on the other. Which cards must you flip to test the rule?
Question 4
5
A truth-teller always tells the truth, a liar always lies, and a spy sometimes tells truth and sometimes lies. You meet three people: Alice, Bob, and Carol. Alice says, 'I am not the spy.' Bob says, 'Alice is the liar.' Carol says, 'Bob is the truth-teller.' What is Carol's true role?
Question 5
6
A box contains either a gold coin or a silver coin. There are two inscriptions on the box: 'Exactly one of these statements is true.' and 'The coin in this box is gold.' Which coin is in the box?
Question 6
7
You have two identical hourglasses: one measures 7 minutes, the other measures 4 minutes. Using only these hourglasses, how can you measure exactly 9 minutes?
Question 7
8
Three gods A, B, C are called True, False, and Random. True always speaks truth, False always lies, Random answers randomly. They respond with 'da' or 'ja', which mean yes or no but you don't know which. You may ask three yes/no questions, each to one god. What single question, asked three times, can determine their identities?
Question 8
9
A hotel has infinitely many rooms numbered 1,2,3,... All rooms are occupied. A new guest arrives. How can the hotel accommodate the new guest without turning anyone away?
Question 9

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The Labyrinth of Logic

Quiz Intelligence

Quiz Questions

Five friends—Alex, Blake, Casey, Drew, and Evan—finished a race in different places from 1st to 5th. Alex finished two places ahead of Blake. Casey finished immediately behind Drew. Evan did not finish last. Blake did not finish first. Who finished second?

Four cards lie on a table, each with a letter on one side and a number on the other. The visible sides show: A, B, 2, 3. The rule is: If a card has a vowel on one side, then it must have an even number on the other. Which cards must you flip to test the rule?

A truth-teller always tells the truth, a liar always lies, and a spy sometimes tells truth and sometimes lies. You meet three people: Alice, Bob, and Carol. Alice says, 'I am not the spy.' Bob says, 'Alice is the liar.' Carol says, 'Bob is the truth-teller.' What is Carol's true role?

A box contains either a gold coin or a silver coin. There are two inscriptions on the box: 'Exactly one of these statements is true.' and 'The coin in this box is gold.' Which coin is in the box?

You have two identical hourglasses: one measures 7 minutes, the other measures 4 minutes. Using only these hourglasses, how can you measure exactly 9 minutes?

A hotel has infinitely many rooms numbered 1,2,3,... All rooms are occupied. A new guest arrives. How can the hotel accommodate the new guest without turning anyone away?

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