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Hardest Impossible Riddles

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Explore 20+ unique, interactive hardest impossible riddles puzzles.

Interactive Riddle Challenge

Showing Hardest Impossible Riddles riddles
Hard +24 XP
The Rope Burning 15 Minutes
1 rope burns in 60m non-uniformly. How to measure 15 minutes using 2 such...
4,495 solved Hardest Impossible Riddles
Hard +24 XP
The Airplane Refueling
Plane holds fuel for 1/2 world flight. Min support planes needed to get 1...
4,478 solved Hardest Impossible Riddles
Hard +24 XP
The 100 Lightbulbs Pass
100 bulbs turned off. 100 people pass toggling multiples of their number (1, 2,...
3,266 solved Hardest Impossible Riddles
Hard +25 XP
The Blindfolded Card Flip
52 deck: 10 face up, 42 face down. Blindfolded, separate deck into 2 piles...
2,566 solved Hardest Impossible Riddles
Medium +18 XP
The Spherical Planet Journey
A man walks 1 mile South, 1 mile East, 1 mile North, landing back...
3,935 solved Hardest Impossible Riddles
Hard +25 XP
The Pirate Gold Division
5 rational pirates divide 100 gold coins by seniority vote (50% needed to survive)....
2,311 solved Hardest Impossible Riddles
Hard +24 XP
The Two Envelope Exchange
Envelope A has $X, Envelope B has $2X or $X/2. Switching gives expected value...
1,578 solved Hardest Impossible Riddles
Hard +25 XP
The Chaser and Target
A fox chases a rabbit at 2x speed. Rabbit runs in circle of radius...
4,285 solved Hardest Impossible Riddles
Hard +25 XP
The 100 Red/Blue Hats
Line of 100 people, red or blue hats. Everyone sees hats ahead. Last person...
4,116 solved Hardest Impossible Riddles
Hard +24 XP
The Poison Bottle Grid
10x10 grid of 100 bottles, 1 poisoned. 4 test strips reveal row/col in 1h....
4,746 solved Hardest Impossible Riddles
Hard +25 XP
The King’s 1000 Wine Bottles
1000 bottles of wine, 1 poisoned. Poison kills in 24 hours. How many prisoners...
2,267 solved Hardest Impossible Riddles
Hard +25 XP
The 100 Floor Egg Drop
2 eggs, 100 floor building. Find highest floor egg survives with minimum worst-case drops.
1,235 solved Hardest Impossible Riddles

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