From Math Puzzle Wiki

Welcome to the Math Puzzle Wiki

This is a collection of my favorite puzzles and brain teasers which contain some mathematical content. Most every puzzle here is taken from somewhere else, usually without express permission. When I can, I'll credit the source of the puzzle, but most come from "folklore" and have been retold many times by many people.

See All categories for more.

Full list of puzzles

7 orbs	Angels and demons	Around the world
Bags of gems	Ball drop	Blank dice
Cannibals and missionaries	Chests of logic	Commuter
Detective Merlin	Die Hard III	Divisible by nine digits
Double Russian roulette	Earings	Egg timers
Eight options with six sides	Eight queens	Eight weights
Failed exams	Fair biased coin	Farmer and the boat
Fat travelers	Fill in the blanks	Five digits and one
Five hats	Five pirates	Five towns
Fly around the world	Flying trains	Forty thieves
Four travelers	Friends at a party	Friends or non-friends
Frog staircase	Fruit boxes	Fuses
GO ON BOB	Gem thief	Girl, boy and dog
Green eyed dragons	Harry Potter and the hall of 100 doors	High school play
Hotel change	Houses and utilities	Jogging a hill
Knight vs. dragon	Lean meat	Liars and Truthtellers
Light bulb	Lying monkey	Lying to the young
Marble madness	Measuring Water	Milk and coffee
Monk's walk	Monty Hall problem	Multiple locks
Next letter	Next sequence	Nine minute fuse
Nine prisoners	Nine weights	Palindromic odometer
Poison	Prisoners in red hats	Probably blackjack
Prom problem	Red vs black	Round trip winds
Seven elevators	Seven orbs	Sharing water
Six towns	Six weights	Soda machine
Splitting ten	Ten bags of gold	Ten digit number
Ten thieves	Three chests	Three couples
Three guesses	Three logicians	Three princesses
Three prisoners	Three sons	Times of day
True or false	Turn off a calculator	Twelve weights
Two EGGs	Two guards	Wrong address
Wrong clocks

References

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