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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 
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 
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 
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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Matching Cards 








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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PutTogether Puzzles 








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 notwopearlsinline arrangement. 

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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 
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 
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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StainedGlass Circle 
by
Henry E. Dudeney 

An enigmatic pattern of the stainedglass 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? 

Play 
Download 








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 
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 
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 
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 
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 
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 fourfigure numbers
can be formed. How many? And what they all would add up to? 

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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 
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 
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 
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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Download 








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... 

Play 
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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 
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 
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 
after
Henry E. Dudeney 

A houselike 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 
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 
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? 
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 
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 
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 
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 
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 
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 
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 
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 
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 
by
Henry E. Dudeney 

It consists of nine rectangles, it uses five colors, and it reminds you of
the "differentcolorsinrowsandcolumns" challenge all the way. 

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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 
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 
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 
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