
Band around the Earth
The circumference of the Earth is approximately 40...
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Beads Duo
You have six beads placed in a plane.
The...
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Clock in the Mirror
Joey leaves his house in the morning to go to day...
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Color Cubes
There are nine compositions (A to I) of eight...
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Con Fusing
In front of you are several long fuses. You know...
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Cubic Outlines
How many outlines of triangles of all sizes and...
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Diophantus
We know very little about the life of the...
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Double Hearts Ratio
Which area is bigger: the total orange or the...
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Dropping Balls
You have to do an experiment to determine the...
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Four Cubes Outlines
In the illustration four flat cubelike shapes are...
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Girl, Boy and Dog
A girl, a boy, and a dog start walking down a road...
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Hairytown
The founders of Hairytown decreed years ago...
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Hourglasses 1
You need to boil eggs for exactly 9 minutes, or...
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Hourglasses 2
An eccentric professor used a unique way to...
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Making the Average
If I drive halfway to the city at 30 km/hour, how...
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Matchstick Frame
There are five squares (one 3x3 and four 1x1)...
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Measuring 2 Litres
Measure exactly 2 liters of water if you...
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Measuring 2, 2 and 3 Liters
You have three bowls: 7, 4 and 3 liters in...
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Measuring 4 and 4 Litres
You are camping, and have an 8liter bowl which is...
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Measuring 4 Liters
You are doing some gardening, and need exactly 4...
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Measuring 6 Liters
You are going to mix up some concrete, and in...
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Measuring 8, 8 and 8
You have a full bucket containing 24 liters of...
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Measuring Just 1 Liter
Imagine having three bowls, with the following...
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Measuring Kilograms
In front of you is a balance.
Can you devise a...
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Midnight
If it were two hours later, it would be half as...
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Mobile Digits
You have a mobile with a keyboard which consists...
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Office Weighings
You have a balance and the following items of...
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One More Square
Seven matchsticks form two squares as shown in the...
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Only 4 Weights
You have a balance scale with four weights. With...
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Parted Circle
You have nine circles (divided into 16 smaller...
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Parted Square
You have six squares (divided into 6x6 smaller...
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Planes Around the World
You intend to fly nonstop around the world....
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Pool and Taps
A pool has four taps.
The first tap takes two...
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Root Jigsaw
Two of the four jigsaw tiles have the same sum of...
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Surplus Tetramino
If you reassemble the pieces of each of the four...
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The Fly and The Trains
Two trains are 200 km apart, and travelling...
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Three Vessels
There are three different color cylindrical...
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Triangle Man Puzzle
Six coins make the Triangle Man shown in the...
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Unfold the Prism
Eight folding patterns are scattered around a...
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Water Level
There's a toy boat floating in a pool.
Place a...
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Weighing 10 Bags
You have 10 bags full of coins, in each bag are 1...
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Weighing 9 Balls
You have 9 balls, equally big, equally heavy ...
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Weighing Bags of Coins
You have eight bags, each of them containing 48...
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Weighing Jelly Babies
Real jelly babies have a mass of 10 grams, while...
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Weighing Pool Balls
One of twelve pool balls is a bit lighter or...
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