Subcategory

Hard Logic Riddles

Part of Logic Riddles collection

Explore 20+ unique, interactive hard logic riddles puzzles.

Mind-bending logical challenges that require deep analytical thinking. Only the sharpest minds prevail.

Interactive Riddle Challenge

Showing Hard Logic Riddles riddles

The Sum of Angles

What is the sum of the interior angles of a 100-sided polygon?

15,765 solved Hard Logic Riddles

The Blue and Red Hats

5 people stand in a line. Each wears a red or blue hat. Each...

23,230 solved Hard Logic Riddles

The Fibonacci Modular

What is the ones digit of the 100th Fibonacci number?

8,759 solved Hard Logic Riddles

The Logicians Drinks

Three logicians walk into a bar. The bartender asks: Does everyone want a drink?...

3,207 solved Hard Logic Riddles

The Majority Element

An array has n elements. One element appears more than n/2 times. You can...

18,943 solved Hard Logic Riddles

The King Coin Problem

A king places 100 coins in a line, some gold side up, some silver....

19,443 solved Hard Logic Riddles

The Digital Root

What is the digital root of 2^2024?

17,180 solved Hard Logic Riddles

The Two Fuses Revisited

You have two fuses that each burn for exactly 1 hour but burn at...

16,234 solved Hard Logic Riddles

The Ballot Problem

Candidate A gets 60 votes, B gets 40. What is the probability A leads...

24,403 solved Hard Logic Riddles

The Paradise Island

On an island, married couples know each others infidelity but not their own. A...

1,546 solved Hard Logic Riddles

The Chessboard Knight

Can a knight visit every square on a standard 8x8 chessboard exactly once?

13,488 solved Hard Logic Riddles

The Prisoners and Light Switch

100 prisoners. One room with a light switch (initially off). Prisoners visit the room...

16,182 solved Hard Logic Riddles

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