Henry E. Dudeney

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This page gathers all puzzles presented at Puzzles.COM, which are either created by Henry E. Dudeney or made after some of his puzzle ideas.

Eight Sticks
Eight Sticks
after Henry E. Dudeney
You have eight sticks, four of them being exactly half the length of the others. Can you arrange them into three squares of the same size?
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Choco Squares 2
Choco Squares 2
by Henry E. Dudeney
How to convert an irregular chocolate bar into a regular one? Just divide it into several pieces and then rearrange them. The question still remains what are the pieces?
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Tessellated Tiles
Tessellated Tiles
by Henry E. Dudeney
Twenty tessellated square tiles each one consisting of four color cells. Your goal is just to select 16 of them and arrange the square in which every cell matches color to color.
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Square Table Top
Square Table Top
by Henry E. Dudeney
Seven pieces are already fitted into a square table top. One is left, and, unfortunately, the cabinetmaker doesn't know how to be with it. Can you help him to solve this fitting challenge?
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Pearls in the Grid
Pearls in the Grid
by Henry E. Dudeney
No two pearls from among those placed in the cells or a grid are in the same row, column, or diagonal. Moving three of them it's still possible to preserve the no-two-pearls-in-line arrangement.
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The Theobalds Maze
The Theobalds Maze
by Henry E. Dudeney
Start at one of the four possible entrances and trace a route to the heart of the maze. Is there something unusual about the maze and your possible route?
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A Hopscotch Puzzle
A Hopscotch Puzzle
by Henry E. Dudeney
Draw a continuous line with no self crossings. This time it's a hopscotch figure that should be drawn, and there are no significant problems to do it.
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In the Space
In the Space
after Henry E. Dudeney
A challenge with drawing several lines to obtain a number of regions with a certain object in each of them. This time the theme is taking from the space - sky and the spacepods.
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Stained-Glass Circle
Stained-Glass Circle
by Henry E. Dudeney
An enigmatic pattern of the stained-glass circle with an intriguing question of how many continuous strokes are required to draw it without taking you pencil off the paper. Want to try it right away?
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Rose Garden 2
Rose Garden 2
after Henry E. Dudeney
A nobleman has complicated for his gardener the task of planting ten roses in the garden into five lines with four roses in every line. See what the complication really is...
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A Simple Cryptarithm
A Simple Cryptarithm
by Henry E. Dudeney
A "cryptarithm" stands for a puzzle where you have to reveal the hidden numbers to make some calculations correct. Try this simple classic one.
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The Eight Cards
The Eight Cards
by Henry E. Dudeney
A true classic gem passed through the time. Despite the fact you need just simple arithmetic skills to get to the solution, it will make you be thinking slightly out of the box.
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Send More Money
Send More Money
by Henry E. Dudeney
Of course, this isn't our appeal! We just want to propose you this great classic cryptarithm that will improve your ability to calculate.
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Up to 100
Up to 100
by Henry E. Dudeney and Martin Gardner
Digits 1 through 9 stand in a row in ascending order. Just insert a number of pluses and minuses between them and get 100. And what about the descending order?
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The Dice Sum
The Dice Sum
by Henry E. Dudeney
A set of four dice, though not marked with spots in the ordinary way, but with digits. When put together a plenty of different four-figure numbers can be formed. How many? And what they all would add up to?
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Digits in the Square
Digits in the Square
by Henry E. Dudeney
This is a 3x3 square grid where the rows are the most important. Nine different digits to be arranged into three numbers observing a special rule. Take a look at it to see the rule...
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The Four Sevens
The Four Sevens
by Henry E. Dudeney
We can arrange four 5's to produce one hundred quite easily, using some arithmetical signs. The question is how easy it is to arrange four 7's to obtain the same result?
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Nine Digits
Nine Digits
by Henry E. Dudeney
Nine digits are arranged into two groups of two numbers each. When the numbers are multiplied in each group the resulting product is the same. What is the biggest amount which can be created in such groups?
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Simple Multiplication
Simple Multiplication
by Henry E. Dudeney
Some multiplications can be done in an unusual way by moving a digit from one position to another. This challenge is about the multiplication and... a proper number which such a multiplication should be applied to.
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An Easy Dissection Puzzle
An Easy Dissection Puzzle
by Henry E. Dudeney
Four in one! Exactly such a number of identical figures complete this shape. Make them visible and see if you'll recognize 'em...
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Improvised Chessboard
Improvised Chessboard
by Henry E. Dudeney
Restore a perfect chessboard dividing its "irregular" prototype into just two pieces. Is this possible at all?
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Patchwork Quilts
Patchwork Quilts
by Henry E. Dudeney
It is claimed the two patchwork quilts can be successfully joined together in a new one with cutting along the stitches in no more than four pieces in total. Would you dare to complete such a needlework challenge?
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Choco Squares
Choco Squares
by Henry E. Dudeney
Suppose you have an irregular bar of chocolate which has to be divided equally among five kids and everyone wants to obtain the portion in the shape of square only. That's what the challenge is about.
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Ceramic Tiles
Ceramic Tiles
after Henry E. Dudeney
A house-like shape can be divided into no more than X parts which in turn can create a perfect square. Go to the challenge to see the shape and discover what number X stands for.
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The Impossible Hole
The Impossible Hole
after Henry E. Dudeney
You know already how to pass a person's body through a postcard, don't you? Now it's only a new dollar that should be passed, but through... a penny size hole.
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Spider Ride
Spider Ride
by Henry E. Dudeney
What is the shortest trip for a spider to get from one spot on a rectangular box to another? Does the straight and clear line that it seems to be at first sight will be the shortest?
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How Many Minutes?
How Many Minutes?
after Henry E. Dudeney
How many minutes is it until X o'clock if Y minutes ago it was N times as many minutes past Z o'clock? Will the challenge sound less complicated when the variables are replaced with the numbers?
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Painting a Pyramid
Painting a Pyramid
by Henry E. Dudeney
A solar spectrum consists of seven colors. A triangular pyramid consists of four faces. The question is in how many distinctive ways the pyramid can be painted using each time only the colors from the solar spectrum?
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Counting the Triangles
Counting the Triangles
by Henry E. Dudeney
A pentagon divided with five lines proposes us a grid where several triangles are hidden. How fast can you count all of them? Is any method required to do this?
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The Six Pencils
The Six Pencils
by Henry E. Dudeney
Another gem in our series of puzzles where several things should be placed so that each of them touches every other. This time you'll need... six and more pencils.
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Fold the Sheet
Fold the Sheet
by Henry E. Dudeney
There are many ways to fold a 2x4 rectangle into a 1x1 packet. But what is the way for folding it into a packet with numbers in serial order inside?
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The Dovetailed Block
The Dovetailed Block
by Henry E. Dudeney
Sometimes when two solids are perfectly dovetailed together it looks impossible to take them apart. It makes the question: is there still any backward way or not?
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Strip to Pentagon
Strip to Pentagon
by Henry E. Dudeney
Can the rectangle coordinates provide us with a perfect pentagon? Yes, they can! Now the puzzle is to reveal how to make such a pentagon from... a simple strip.
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Six Knights
Six Knights
by Henry E. Dudeney
Foxes and Geese is another popular version of this chess black and white knights exchange puzzle that has to be completed in fewest possible moves.
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An Easy Square Puzzle
An Easy Square Puzzle
by Henry E. Dudeney
Use five pieces of equal size and make a square. You're allowed to divide one of them into two parts, but what to do with the other four?
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The Testa
The Testa
by Henry E. Dudeney
It consists of nine rectangles, it uses five colors, and it reminds you of the "different-colors-in-rows-and-columns" challenge all the way.
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The Six Pennies
The Six Pennies
by Henry E. Dudeney
Transform the two rows of coins into a perfect hexagon simply sliding them. And there is only one additional spec for the sliding...
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A Match Trick
A Match Trick
by Henry E. Dudeney
How to shake a box of matches so that to make exactly one of them turned round and, of course, let all the matches be sound? Any ideas how on it?..
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The Five Pennies
The Five Pennies
by Henry E. Dudeney
Maybe it is easy to place four coins in such a way that each coin touches every other one. But what would you say about five coins? Yes, it is possible too.
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Last Updated: December 27, 2011 top
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