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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. |
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Eight Sticks |
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after
Henry E. Dudeney |
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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 |
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by
Henry
E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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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 |
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Square Table Top |
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by
Henry E. Dudeney |
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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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Put-Together Puzzles |
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Pearls in the Grid |
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by
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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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 |
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after
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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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 |
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after
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney and
Martin Gardner |
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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 |
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by
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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Restore a perfect chessboard dividing its "irregular" prototype into just
two pieces. Is this possible at all? |
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Patchwork Quilts |
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by
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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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 |
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after
Henry E. Dudeney |
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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 |
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after
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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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? |
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after
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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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 |
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by
Henry E. Dudeney |
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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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