Challenging Puzzles

Test your logic, mathematical reasoning, analytical thinking and problem-solving skills.

235

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Riddles Hard

The more you take from me, the larger I become. What am I?

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Riddles Hard

I become smaller every time I take a bath. What am I?

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Critical Thinking Expert

A company says, "Our product has no negative reviews, therefore every customer is satisfied." What important information could be missing?

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Critical Thinking Hard

A store reports that sales increased after a new advertisement was launched. Can we conclude that the advertisement caused the entire increase?

19 views Featured

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Critical Thinking Medium

A statement says: "All employees who work remotely use a laptop. Ravi uses a laptop. Therefore Ravi works remotely." Is this conclusion logically guaranteed?

18 views Featured

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Interview Brain Teasers Hard

You have a building with 100 floors and two identical glass balls. You need to determine the highest floor from which a ball can be dropped without breaking, while minimizing the worst-case number of drops. What is the classic strategy based on?

18 views Featured

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Latest Puzzles

Logical Puzzles Medium

Six people A, B, C, D, E and F sit in a row. A sits immediately to the left of B. C sits immediately to the right of D. E sits at the extreme left. F sits at the extreme right. Who occupies the two middle positions?

17 views Test your skills

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Logical Puzzles Hard

Five students P, Q, R, S and T scored different marks. P scored more than Q but less than R. S scored less than Q. T scored more than R. Who scored the highest and who scored the lowest?

14 views Test your skills

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Logical Puzzles Hard

Four tasks W, X, Y and Z must be completed one at a time. W must be before X. Y must be before Z. X must be before Y. Which task must be completed third?

25 views Test your skills

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Logical Puzzles Expert

Seven runners finish a race. A finishes before B. B finishes before C. D finishes after C. E finishes before A. F finishes after D. G finishes before E. Who must finish before everyone else?

16 views Test your skills

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Logical Puzzles Medium

A library has books numbered 1 through 50. Every fifth book is placed on a special shelf. How many books are on the special shelf?

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Mathematical Puzzles Medium

The sum of two numbers is 84 and their difference is 18. What is the larger number?

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Mathematical Puzzles Hard

A number is 30% less than 200. What is the number?

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Mathematical Puzzles Hard

The product of two consecutive positive integers is 156. What are the integers?

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Mathematical Puzzles Expert

A three-digit number has digits whose sum is 12. The hundreds digit is twice the tens digit, and the units digit is three more than the tens digit. What is the number?

15 views Test your skills

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Mathematical Puzzles Hard

A tank contains 90 litres of water. One-third of the water is removed and replaced with an equal amount of clean water. How much of the original water remains?

18 views Test your skills

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Brain Teasers Medium

What has keys but cannot open locks, has space but no room, and you can enter but cannot go inside?

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Brain Teasers Medium

What gets wetter the more it dries?

12 views Test your skills

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Featured Puzzles

The more you take from me, the larger I become. What am I?

I become smaller every time I take a bath. What am I?

A company says, "Our product has no negative reviews, therefore every customer is satisfied." What important information could be missing?

A store reports that sales increased after a new advertisement was launched. Can we conclude that the advertisement caused the entire increase?

A statement says: "All employees who work remotely use a laptop. Ravi uses a laptop. Therefore Ravi works remotely." Is this conclusion logically guaranteed?

You have a building with 100 floors and two identical glass balls. You need to determine the highest floor from which a ball can be dropped without breaking, while minimizing the worst-case number of drops. What is the classic strategy based on?

Latest Puzzles

Six people A, B, C, D, E and F sit in a row. A sits immediately to the left of B. C sits immediately to the right of D. E sits at the extreme left. F sits at the extreme right. Who occupies the two middle positions?

Five students P, Q, R, S and T scored different marks. P scored more than Q but less than R. S scored less than Q. T scored more than R. Who scored the highest and who scored the lowest?

Four tasks W, X, Y and Z must be completed one at a time. W must be before X. Y must be before Z. X must be before Y. Which task must be completed third?

Seven runners finish a race. A finishes before B. B finishes before C. D finishes after C. E finishes before A. F finishes after D. G finishes before E. Who must finish before everyone else?

A library has books numbered 1 through 50. Every fifth book is placed on a special shelf. How many books are on the special shelf?

The sum of two numbers is 84 and their difference is 18. What is the larger number?

A number is 30% less than 200. What is the number?

The product of two consecutive positive integers is 156. What are the integers?

A three-digit number has digits whose sum is 12. The hundreds digit is twice the tens digit, and the units digit is three more than the tens digit. What is the number?

A tank contains 90 litres of water. One-third of the water is removed and replaced with an equal amount of clean water. How much of the original water remains?

What has keys but cannot open locks, has space but no room, and you can enter but cannot go inside?

What gets wetter the more it dries?