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






Find the Center 
by
Martin Gardner 

See how several bows inside a circle make you stuck in the illusion about
where the true center of this circle is. Can you get out of it with the
help of your eyes only? 

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Red, White, and Blue Balls 
after
Martin Gardner 

It's known there is one heavier ball in each of the three pairs. Now the
object is using a balance scale in just two weighings to determine the
light and the heavy balls in each pair... 

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Fish's Weight 
after
Martin Gardner 

This classic puzzle gem easy shows that sometimes it can be not very easy
to understand how much a simple half of a whole is. 

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Heavy Weight 
after
Martin Gardner 

Two weighings are required to identify the heavier thing among the four
identical ones. Two weighings are required for the nine things as well.
But how on it in the latter case?.. 

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Big CrossOut Swindle 
after
Martin Gardner 

Cross out something in a line of letters to get another something. Of
course, you will be provided with both "something"  the point is to get
them right. 

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Key Word 
after
Martin Gardner 

When the four arrows on the four keys are replaced with some respective
letters on them, a very familiar word can be typed with those keys. What
word it could be? 

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What Animal? 
after
Martin Gardner 

A set of five different letters can be arranged in such a way that to
produce the name of an animal. Now the first question that might appear
what familiar animal should it be? 

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FillinWords 
after
Martin Gardner 

Complete six threeletter words with the missing middle letters in them so
that except these words a new sixletter word which would be a name of a
sea animal could appear. 

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Shortest Connection 
after
Martin Gardner 

Suppose you have to build a railroad network between four cities placed in
the corners of a perfect square. What pattern must you choose to minimize
it? 

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Six Numbers 
by
Martin Gardner 

Solving this puzzle you can circle with a feeling that you're one step
before your goal or... one step behind. Is there any kind of joke to get
exactly on it? 

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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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Darts Count 
after
Martin Gardner 

How many darts will you need to toss and which rings with numbers will you
need to target in order to score exactly 100? Before scoring this number
you can try to score the 50 first. 

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Cube Dates 
after
Martin Gardner 

It is said that two cubes with twelve digits on their faces are enough to
produce any date of year from them. Can you discover how the digits should
be placed on the cubes? 

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Crazy Cut 
after
Martin Gardner 

The only cut has to be done to divide this strange figure into two
identical parts. The question is where it should go through? 

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Crazy Cut Suite 
after
Martin Gardner 

Four shapes. It is said each of them can be divided into two identical
pieces. The goal is to find the proper positions for the dividing cuts.
How complicated the dissection challenges can be? 

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The Triamond 
after
Martin Gardner 

A trapezoid which is formed by joining three equilateral triangles is
called a triamond. The triamond can be cut into four congruent parts. But
it is said there are two different ways to do that. Check it! 

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Six Cubes 
by
Martin Gardner 

Is there any successful way to arrange six identical cubes into some shape
so that every cube in the shape will get in touch with others? 

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Cube Angle 
after
Martin Gardner 

Two lines are drawn on the two
sides of a cube. They are drawn form the same corner and the question is
which angle do these lines form? How to figure that out? 

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Square Intersection 
after
Martin Gardner 

This geometrical problem is about an elegant and neat way how to figure
out the exact area of the overlapping of two squares. Don't you want to
discover this way by yourself? 

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Rectangle Around 
after
Martin Gardner 

Figure out the diagonal of a
rectangle when it is inscribed in the quadrant of a circle. How long, do
you think, it will take you to get the right answer to this geometrical
question? 

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Rays Through the Squares 
after
Martin Gardner 

The three rays that come through the three squares create the three angles. A
proof is required to be found that the sum of two angles equals the third
one. 

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Hexagon Inside the Cube 
after
Martin Gardner 

It is quite easy to get the cross sections in form of a square or a
regular triangle from a cube. Is it so easy to get the cross section of a
regular hexagon from the same cube? 

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Outside the Hole 
after
Martin Gardner 

A disk of certain diameter is removed from a piece of paper creating a
circle hole in it. The goal is to calculate the area which still remained
around the hole. 

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The Earth Belt 
by
Martin Gardner 

Imagine a steel belt is stretched tightly around a big planet. What things
can be possibly slipped under the belt, if a meter of steel added to the
belt raises it off the sphere's surface by the same distance all the way
around? 

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A Bottle and a Cork 
after
Martin Gardner 

Is it difficult to figure out the exact costs of two things when you know
their total cost and a difference only? Don't let the figures mislead you
while counting. 

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The Mutilated Chessboard 
after
Martin Gardner 

Another classic puzzle gem that should bring you an "aha!" no matter, if
you solve it by yourself or go right to the solution page. Enjoy the
beauty of the logical proof! 

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Colored Names & Hair 
after
Martin Gardner 

The last names of Merle White, Leslie Black and Jean Brown don't match the
colors of their hair. From a little conversation between them can you
determine the color of Leslie Black's hair? 

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Bugs' Traffic 
after
Martin Gardner 

The four bugs standing in the corners of a square start to crawl one
toward each other. Here comes the question: How far does each bug travel
before they all meet? 

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Cube Cuts 
after
Martin Gardner 

It is said a cube can be easily cut into 27 smaller cubes with six straight cuts. Can
this number of necessary cuts be reduced by arranging the pieces after
each cut? 

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In 'n' Out 
after
Martin Gardner 

How to guess whether a certain region is inside a closed curve or outside
it when a part of the curve is not visible? Is there any clear and simple
method to do this? 

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How Old is the RoseRed City? 
after
Martin Gardner 

Read through five lines expressed in verse and try to come up with an
exact age of the RoseRed city. Be careful and accurate while calculating
in order to avoid any mistake. 

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Next Symbol 
after
Martin Gardner 

It seems a sequence of five odd symbols can be proceeded. Will you need
the sixth sense to figure out the sixth symbol? 

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The Two Spirals 
by
Martin Gardner 

Two almost similar spirals... One of them consists of a single piece of
rope, while the other is formed with two separate pieces of rope. The
question is which is which? 

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Name the Month 
by
Martin Gardner 

It is said this set of strange symbols stands for a month. What should
be the possible approach to break this "code" down and thus, decipher
what month it can be? Will it be a forthright approach or more
complicated? 

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The Rule 
by
Martin Gardner 

It is known there is a rule connecting different patterns in each given
row of their array. The challenge is to figure out what is the rule and
then properly applying it complete the last row of them. 

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Counting the Squares 
after
Martin Gardner 

There are several squares of different sizes hidden in a simple shape. You
goal is just to identify the exact number of them, not overlooking even a
little single square. 

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The Twiddled Bolts 
by
Martin Gardner 

When two identical bolts are placed together so that their helical grooves intermesh, what it is supposed to happen when the bolts are moved around each other in the clockwise direction? 

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Strip to Cube 
by
Martin Gardner 

A strip of six squares is not among those hexominoes that can be folded
into a oneunit cube. But it's said the seventh square added to the strip
may help. 

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Square to Cube 
by
Martin Gardner 

Cut out some shape from a perfect square, then apply to it some folding
and get... a perfect cube. It's not squaring the circle, but could it be
cubing the square? 

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Unattacked Cells 
after
Martin Gardner 

Do you believe five chess queens placed on a 5x5 board create a unique
pattern when a maximum number of unattacked vacant cells is left? 

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The Knight's Tour 
after
Martin Gardner 

Make a knight's tour on a small chess board visiting every cell only once
and then returning to the initial cell. You may start from any cell of the
board. 

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Three Queens 
by
Martin Gardner 

Is it possible to place three chess queens on a single nonstandard board
so that all vacant cells are attacked? How many ways to do this can you
find? 

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The Knight's Tour 2 
by
Martin Gardner 

A chess knight wants to travel around a 6x6 board making the longest
possible tour without selfcrossings of his route. Can you help him to do
it? 

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The Four Queens 
after
Martin Gardner 

Development of the chess queen theme. This time it's in the little shift
that no queen can attack another  simply let 'em live in peace on a small
chessboard. 

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The 7 Knights Problem 
after
Martin Gardner 

It is easy to place 7 chess knights on a 3x3 board. But it becomes a
little bit different when there is a rule to move the knight after you
place it on the board, don't you say? 

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Pentomino Problem 
after
Martin Gardner 

The 6x10 rectangle arranged from twelve pentominoes is a base for a 2in1
puzzle. First is the dissection challenge. Second is the puttogether
problem. Can you solve them both? 

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No More Squares 
by
Martin Gardner 

More than two dozens of squares are hidden in a simple 4x4 match square
grid. But less than a dozen matches is required to be removed to destroy
all them for good. 

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Four Stacks 
after
Martin Gardner 

Tumping over two coins every time rearrange a row of eight coins into four
stacks of two coins each. It can be done in four jumps  just keep
jumping. 

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Coin Distances 
after
Martin Gardner 

Two distances are associated with three coins. Could you find a certain
position of the coins so that the distances are equal? Is there any way
how the moving coins can distract you from the mission? 

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Crazy Lines 
after
Martin Gardner 

Sometimes a perspective brought into a picture may bring there a kind of
illusion as well. Make sure the picture will not mislead you while finding
out the truth. 

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Compass in a Watch 
after
Martin Gardner 

Have you ever known that your watch can be used as quite a good and
reliable compass? There is an easy way how to convert your working
indicator of time into a working indicator of direction. 

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Fold to Turn 
after
Martin Gardner 

Why does a bill behave so strange to be upright all the way? Maybe it
simply doesn't like to be folded and unfolded? 

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Magic Triangle 
after
Martin Gardner 

Make a triangle of six pieces. Now simply rearrange the pieces within the
triangle and you get... a rectangular hole in it. How did this happen? 

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Count Trick 
after
Martin Gardner 

Believe it or not, they say everyone who calculates not too bad makes... a
mistake while sum up these eight numbers. Make sure about it! 

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Three Dice 
after
Martin Gardner 

Enjoy one mathematical trick based on a fact that the sum of the numbers
on the opposite sides of a die is always seven. 

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Mirror Drawing 
after
Martin Gardner 

Do you wanna feel like a little child for a moment? Then try to draw a
line, but only in a slightly different..."mirror" way. 

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Falling Box 
after
Martin Gardner 

How to make a box of matches fall on one end and stand. Does it really
need some portion of thinking "out of the box"?! 

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Catch or Pass 
after
Martin Gardner 

Do you want to see if your friend can catch the postcard when you let it
fall down? 

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Last Updated: September 21, 2011 
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