Martin Gardner Puzzles

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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
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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Out of Glass
Out of Glass
after Martin Gardner
Get the cherry outside the glass moving exactly two matches. Great classic!
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Red, White, and Blue Balls
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
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
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 Cross-Out Swindle
Big Cross-Out 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
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?
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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Fill-in-Words
Fill-in-Words
after Martin Gardner
Complete six three-letter words with the missing middle letters in them so that except these words a new six-letter word which would be a name of a sea animal could appear.
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Shortest Connection
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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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Bottle and Cork
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
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
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
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
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
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 Rose-Red City?
How Old is the Rose-Red City?
after Martin Gardner
Read through five lines expressed in verse and try to come up with an exact age of the Rose-Red city. Be careful and accurate while calculating in order to avoid any mistake.
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Next Symbol
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
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
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
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
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 Cat
The Cat
after Martin Gardner
How many different triangles can you count in the picture of the cat?
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The Twiddled Bolts
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
Strip to Cube
by Martin Gardner
A strip of six squares is not among those hexominoes that can be folded into a one-unit cube. But it's said the seventh square added to the strip may help.
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Square to Cube
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
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
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
Three Queens
by Martin Gardner
Is it possible to place three chess queens on a single non-standard 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
The Knight's Tour 2
by Martin Gardner
A chess knight wants to travel around a 6x6 board making the longest possible tour without self-crossings of his route. Can you help him to do it?
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The Four Queens
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
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
Pentomino Problem
after Martin Gardner
The 6x10 rectangle arranged from twelve pentominoes is a base for a 2-in-1 puzzle. First is the dissection challenge. Second is the put-together problem. Can you solve them both?
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No More Squares
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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Collating the Coins
Collating the Coins
by Martin Gardner
Change the order of five coins in a chain from big-small-big-small-big to big-big-big-small-small. Another classic puzzle gem!
Play  |  Download  |  More Millennium Puzzles
Four Stacks
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
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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Missing Piece
Missing Piece
after Martin Gardner
Can you find the missing piece of cake? It seems that someone took it...
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Crazy Lines
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
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
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
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
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
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
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
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
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 top
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