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Coin Puzzles
Coins & Triangles
Coins & Triangles
by Kobon Fujimura
Remove some coins from a big coin triangle containing ten coins and a lot of smaller equilateral triangles so that no equilateral coin triangles remain.
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Coin Triangle
Coin Triangle
by Serhiy Grabarchuk
Change the triangle into a square by moving the minimum of the coins. How many coins will you need to move to do this?
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Matchstick Puzzles
Christmas Tree
Christmas Tree
by Serhiy Grabarchuk Jr.
It can be a little Christmas puzzle gift to entertain you for a few minutes at least - only three triangles hidden in a Christmas Tree and the extra one that has to be found.
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The Bat
The Bat
by Serhiy Grabarchuk Jr.  by Peter Grabarchuk
Make the match bat flying away in another direction. What do you think, how many moves will you need to do this? Just three right moves...
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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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Turn the Fish
Turn the Fish
by Kobon Fujimura
How can you move 3 matches to make the fish swim in the opposite direction?
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Puzzling Time
Puzzling Time
by Serhiy Grabarchuk Jr.
Move two matches to get the exact time half past four.
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Put-Together Puzzles
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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Silhouettes
Silhouettes
If several silhouettes are superimposed in a pile in some certain way a silhouette of a rabbit can appear. Moreover two different rabbit's silhouettes can be obtained. Can you find them both?
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Four into One
Four into One
The four identical triangles can be arranged into the same triangle, only bigger. Can you perform the same thing with another set of four identical shapes?
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Lace Loops
Lace Loops
by Peter Grabarchuk
Place six color loops onto a 4x5 grid. No loop should touch any other one; no loop should be left outside the grid’s borders. Is the grid big enough to hold all the loops within strictly following the rules?
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The 8 Angles
The 8 Angles
by Sean Egan
Eight pairs of identical moons are orbiting a green planet. The goal is to connect them all to the planet with a link per moon. It's a harder sequel to The 4 Angles puzzle by the same author.
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The 4 Angles
The 4 Angles
by Sean Egan
There is one Sun and eight planets in this puzzle. And your goal is to supply each planet with its portion of light - exactly one ray per planet. Enjoy and relax!
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Tangrams
The Egyptian Puzzle
The Egyptian Puzzle
Five squares are cut in one way to create five identical pairs of pieces. The resulting set of ten pieces is very appropriate to try yourself in completing some nice shapes from it...
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Cross vs. Square
Cross vs. Square
The four identical pieces can be simultaneously used to form a Greek cross and a perfect square. Can you discover both of these shapes? Any ideas how on it?
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Puzzles with Letters
The M Puzzle
The M Puzzle
Make a symmetric letter M using four pieces. How many strange shapes will you see before you get your perfect letter M?
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Matching Cards
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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Squares 4 Four
Squares 4 Four
by Peter Grabarchuk
A dozen of dots are scattered among the four pieces and your goal is to drive these dots into the corners of the four squares at once.
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Saddle the Horses
Saddle the Horses
Arrange the three cards so that each rider is in his correct riding position on top of each horse.
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Checkerboard Puzzles
TLs
TLs
by Sam Loyd
Can you pack a checkered T-shape and seven checkered L-shapes into a regular 8x8 checkerboard so that to completely fill it in a way that dark and light cells are properly alternating?
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Hard 14
Hard 14
Do you think it is hard enough to assemble 14 different pieces into a regular 8x8 checkerboard? Isn't there any connection between the name and the puzzle itself?
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Broken Checkerboard
Broken Checkerboard
Restore a simple 5x5 checkerboard from the six pieces scattered around. Don't forget to alternate the colors of the cells. Are there many ways to make the board?
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Visual Puzzles
The Lost Star
The Lost Star
by Sam Loyd
Several triangles and quadrangles joined together create an intricate pattern where some perfect star is hidden. Discover that lost one.
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Puzzles with Numbers
Magic Triangle 3X
Magic Triangle 3X
The six numbers from 1 to 6 have to be placed along the sides of a triangle so that to create some magic sum along each of its sides. What magic sums can be there?
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The 26 Puzzle Re_Solution
The 26 Puzzle Re_Solution
after Professor Louis Hoffman
A sequel to The "Twenty-Six" Puzzle. Numbers 1 through 12 and the magic sum of 26 remain, but the seven areas have changed. Will it be harder than the prequel?
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The Number Grid Puzzle
The Number Grid Puzzle
Don't let the adjacent digits be... adjacent. The eight digits are known, a simple grid is drawn and the systematic approach is recommended.
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Puzzles from Championships
Jigsaw Cells 2
Jigsaw Cells 2
by László G. Nagy
Put a set of sixteen jigsaw-like pieces into a jigsaw-like board. The places for many pieces can be discovered based on a logical reasoning. You just have to make the right conclusions. A sequel puzzle to Jigsaw Cells.
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Star Battle
Star Battle
by Zoltán Horváth
Light a couple of stars in each column, each row and each region in the blue sky. No star can touch each other, even diagonally. No guessing while solving, only logical reasoning is required. Thus, how long it will take you to light all the stars? By Zoltán Horváth.
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SMS Codes
SMS Codes
by László Mérő by László G. Nagy
Do you like to type SMS messages with your cell phone? Whatever your answer is, we'd like to offer you more interesting challenge - to read them. Where is the trick? The reading isn't that simple - it's actually code-breaking.
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Finnish Snake
Finnish Snake
by László G. Nagy
A sea serpent lies hidden under the surface of the water with only its head, tail and a few other parts visible. Should it be hard to reveal its entire body from head through tail, knowing it doesn't touch itself anywhere?
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Jigsaw Cells
Jigsaw Cells
by László G. Nagy
Put a set of nine jigsaw-like pieces into a special grid. A distinctive feature of the challenge is that there is a definite logical place and order for each piece to be located within the grid. The goal is only to discover it!
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Mazes
The Knossos Labyrinth
The Knossos Labyrinth
by Serhiy Grabarchuk
You are an architect and you have to restore the labyrinth after the fragments of an old plan. What would be your starting point through these ancient walls?
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Word Puzzles
Doublets
Doublets
by Lewis Carroll
From the Ape to the Man through the series of words - it's the game of Doublets. Will it be easy to reveal all the words in it even if you know their number?
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Puzzles with Weighings
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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Other Non-Manipulative Puzzles
3-vs-2-feat-1
3-vs-2-feat-1
Color the points of a "web" into two colors - red and blue - in such a way that do not allow any sequence of three points of the same color be found in a single line.
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Illusions
CoinDistances
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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Point the Center
Point the Center
by Peter and Serhiy Grabarchuk
Only one of the nine arrows points exactly into the center of the circle, all of the remaining are only close to it. Can you guess without any additional measures which one is it?
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Tricks
Where Is the 5?
Where Is the 5?
by Serhiy Grabarchuk
Four pieces form a square with the magic square on it. Just flip over the pieces and try to make a square once again. Can you say why does a part of it disappear?
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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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Rainbow Necklace Trick
Rainbow Necklace Trick
by Serhiy Grabarchuk
Show to your spectators which bead was chosen by one of them from any of seven necklaces you demonstrate.
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Toys
Cover the Red Circle
Cover the Red Circle
Cover a big circle entirely with the five smaller circles. But keep in mind: when a smaller circle is placed on the big one you aren't allowed to move it anymore.
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Doggy Mosaic
Doggy Mosaic
by Serhiy Grabarchuk, Jr.
Find your own way how to complete some mosaic with the figures of these smart dogs. Can you explain how it can be?
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Last Updated: June 29, 2008 top
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