
1. 
pretorik 
 
161 
2. 
markr 
 
116 
3. 
Gordon Weir 
 
104 
4. 
mbloomfi 
 
97 
5. 
Dennis Nazarov 
 
96 
6. 
zzz123 
 
72 
7. 
Srikanta 
 
56 
8. 
lidSpelunker 
 
53 
9. 
SAMIH FAHMY 
 
48 
10. 
jkr 
 
44 




1. 
denisR, mishik 
 
236 
2. 
alan, De_Bill 
 
231 
3. 
dddfff 
 
228 
4. 
kavfy 
 
221 
5. 
idler_ 
 
106 
6. 
akajobe 
 
94 
7. 
tolstyi 
 
56 
8. 
STARuK 
 
42 
9. 
vale 
 
31 
10. 
xandr 
 
11 





Place numbers 1,2,.., 9 without repetitions into a 3x3 square so that
the sums in all rows, columns, and diagonals are all equal. 


Puzzle statistics "Numbers in a square".
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There is true expression on panel. But only one pixel is defective. Which one?



Puzzle statistics "Defective pixel".
Last updated 5305673.8 minutes ago.

Solved by: 94
Daily average: 0.02
Answers submitted: 129
Viewed by: 294
Fraction solved by: 31.9%
Solved at first attempt: 94.6%
Average discussion length: 1.2
Liked the puzzle: 25
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Links and chains 
Logic puzzles 

Weight: 1 

Liked the puzzle: 100% 

02.04.2011 

Once upon a time, a Megamind worked as a smith. He was brought 5
chains each consisting of 3 links. What is the minimal number of links
that the Megamind should relock to make one long chain? 


Puzzle statistics "Links and chains".
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A Megamind has ordered a set of steel balls for his scientific
experiments: 2 red, 2 orange, 2 yellow, 2 green, and 2 blue.
The order was fulfilled but the balls of some color were made 1g
lighter than the others. The Megamind has a balance scale
that shows the exact weight differential between the two cups. He
needs to determine the defective color using one weighing.
Please, help the Megamind to do this. 


Puzzle statistics "Defective balls".
Last updated 5305673.8 minutes ago.

Solved by: 22
Daily average: 0
Answers submitted: 24
Viewed by: 257
Fraction solved by: 8.5%
Solved at first attempt: 95.4%
Average discussion length: 1.1
Liked the puzzle: 7
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A bottle,a glass, a carafe, and a can contain milk, lemonade,
water, and coke. Water and milk are not in the bottle. The container
with lemonade is immediately between the carafe and the container with
coke. The can does not contain lemonade or water. The glass is next to
the can and the container with milk. The containers form a row. How
exactly are they arranged? 


Puzzle statistics "Milk, lemonade, water, and coke".
Last updated 5305673.8 minutes ago.

Solved by: 19
Daily average: 0
Answers submitted: 21
Viewed by: 259
Fraction solved by: 7.3%
Solved at first attempt: 78.9%
Average discussion length: 1.4
Liked the puzzle: 4
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A Megamind walked along a fence and discovered strange pairs of
numbers. First, he saw "188>4". A bit fаrther, he discovered
"232>0". A few steps after that, "100>2". Then, "163>1". Then he
saw a little boy who was just beginning to paint something. When the
Megamind called a boy, he ran away. Approaching the site, the Megamind
saw an incomplete pair "386>...". He took out his favorite marker and
completed the pair. What number did he write? 


Puzzle statistics "Numbers on the fence".
Last updated 5305673.8 minutes ago.

Solved by: 20
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Answers submitted: 22
Viewed by: 295
Fraction solved by: 6.7%
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Liked the puzzle: 9
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A Megamind is lost in the mountains. He is standing on a path,
shouting for help.
Finally, he sees a local approaching. Megamind knows that the locals
can be knights that always tell the truth, or knaves that always lie.
He also knows that the path leads to the village of knights in one
direction and to the village of knaves in the other. The problems is
that the knaves are also hateful of Megaminds, and will stone him if
gets to their village. How can Megamind ask one question and determine
the right way to go? 


Puzzle statistics "Two villages".
Last updated 5305673.8 minutes ago.

Solved by: 37
Daily average: 0
Answers submitted: 47
Viewed by: 296
Fraction solved by: 12.5%
Solved at first attempt: 83.7%
Average discussion length: 1.4
Liked the puzzle: 11
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Among 101 coins, exactly 50 are counterfeit. A counterfeit coins
weighs one gram more or gram less than the real coin (counterfeit
coins may weigh differently). You have a balance scale that shows the
exact weight differential between the two cups. How can you
determine whether a given coin from this set is counterfeit using the
scale only once? 


Puzzle statistics "101 coins".
Last updated 5305673.8 minutes ago.

Solved by: 15
Daily average: 0
Answers submitted: 16
Viewed by: 293
Fraction solved by: 5.1%
Solved at first attempt: 100%
Average discussion length: 1.0
Liked the puzzle: 4
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50 coins 
Logic puzzles 

Weight: 3 

Liked the puzzle: 100% 

27.12.2009 

Once upon a time, a tsar was holding a reception and the Megamind was
among the guests. The tsar decided to test how smart the Megamind was,
took him into a dark room, and gave the following task: On the table
in this room, there are 50 coins, exactly 10 of them are tails up. In
the darkness, it is impossible to determine the sides of these coins.
Touching the coins also does not help. The Megamind has to separate
these coins into two groups so that the number of tails in both are
equal. Can he do it? 


Puzzle statistics "50 coins".
Last updated 5305673.8 minutes ago.

Solved by: 22
Daily average: 0
Answers submitted: 30
Viewed by: 296
Fraction solved by: 7.4%
Solved at first attempt: 90.9%
Average discussion length: 1.2
Liked the puzzle: 8
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The set of numbers 1,3,8,120 has a remarkable property: the product of
any two numbers is a perfect square minus one. Find a fifth number
that could be added to the set preserving its property. 


Puzzle statistics "The fifth number".
Last updated 5305673.8 minutes ago.

Solved by: 37
Daily average: 0
Answers submitted: 41
Viewed by: 291
Fraction solved by: 12.7%
Solved at first attempt: 97.2%
Average discussion length: 1.1
Liked the puzzle: 11
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1. Continue the sequence a, aa, ba, abaa, aaabba, cabbaa, ...
2. Could symbol "d" eventually appear in this sequence? 


Puzzle statistics "A sequence".
Last updated 5305673.8 minutes ago.

Solved by: 14
Daily average: 0
Answers submitted: 16
Viewed by: 273
Fraction solved by: 5.1%
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A Megamind in a boat 
Geometry puzzles 

Weight: 4 

Liked the puzzle: 100% 

27.12.2009 

A Megamind is sitting in a boat at the center of a circular lake of
radius R. On the lake shore, an evil Goblin awaits. Luckily for the
Megamind, the Goblin can only move along the shore. Unfortunately, the
Goblin is 4 times as fast as the Megamind in his boat. The Megamind
can save himself if he gets to the shore and evades meeting with the
Goblin. Can the Megamind save himself? If yes  how? 


Puzzle statistics "A Megamind in a boat".
Last updated 5305673.8 minutes ago.

Solved by: 10
Daily average: 0
Answers submitted: 18
Viewed by: 296
Fraction solved by: 3.3%
Solved at first attempt: 90%
Average discussion length: 1.2
Liked the puzzle: 4
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A Megamind has 12 coins, one of which is counterfeit and weighs
differently from the others. He has a balance scale, but no weights.
How can the Megamind find the counterfeit coin and determine whether
it is lighter or heavier than the standard ones? What is the minimal
number of weighings required? 


Puzzle statistics "12 coins".
Last updated 5305673.8 minutes ago.

Solved by: 10
Daily average: 0
Answers submitted: 10
Viewed by: 273
Fraction solved by: 3.6%
Solved at first attempt: 80%
Average discussion length: 1.4
Liked the puzzle: 4
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A game with sums 
Games puzzles 

Weight: 5 

Liked the puzzle: 100% 

03.01.2010 

Two players play the following game. An even number of cards are arranged in a row. Each card is marked with a real number. Upon his turn, a player takes a card from either end of the row. Whoever collects the greater sum is a winner. Otherwise, a draw is declared. Which player is guaranteed not to lose? What is his strategy? 


Puzzle statistics "A game with sums".
Last updated 5305673.8 minutes ago.

Solved by: 6
Daily average: 0
Answers submitted: 7
Viewed by: 295
Fraction solved by: 2%
Solved at first attempt: 100%
Average discussion length: 1.0
Liked the puzzle: 2
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A 52 card trick 
Logic puzzles 

Weight: 5 

Liked the puzzle: 100% 

26.12.2009 

A famous magician takes a standard 52 card deck and gives it to the audience. The spectators choose any 5 cards (they may do it any way they like) and pass these cards to the magician's assistant. The assistant announces 4 of these cards out loud. The magician responds by naming the fifth card. Except for the suit and denomination of each card, the assistant passes no other information to the magician. How does the magician "know" the fifth card? 


Puzzle statistics "A 52 card trick".
Last updated 5305673.8 minutes ago.

Solved by: 9
Daily average: 0
Answers submitted: 15
Viewed by: 296
Fraction solved by: 3%
Solved at first attempt: 88.8%
Average discussion length: 1.4
Liked the puzzle: 3
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Divide a parallelogram 
Geometry puzzles 

Weight: 5 

Liked the puzzle: 100% 

02.04.2011 

How to divide a parallelogram into 9 isosceles triangles? 


Puzzle statistics "Divide a parallelogram".
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