
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 6073716.8 minutes ago.

Solved by: 94
Daily average: 0.02
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A row of six glasses is on a table. Three full glasses are followed by
three empty glasses. Is it possible to make these glasses alternate:
full,empty full, etc by touching only one glass? 


Puzzle statistics "Six glasses".
Last updated 6073716.8 minutes ago.

Solved by: 50
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You have 8 coins that appear to be identical, except one (which is
counterfeit) is slightly heavier than the others. What is the
minimal number of weighings on the balance scale that is required to
find the counterfeit coin? 


Puzzle statistics "8 coins".
Last updated 6073716.8 minutes ago.

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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 6073716.8 minutes ago.

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Answers submitted: 21
Viewed by: 259
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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 6073716.8 minutes ago.

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Using numbers 1,3,4,6, and basic arithmetic operations (addition,
subtraction, multiplication, and division) and parentheses, obtain and
expression that evaluates to 24. You may use only these numbers and
only these operations. Every number should be used exactly once.
Numbers cannot be concatenated, i.e. you cannot use 13 or 146. 


Puzzle statistics "Obtain 24".
Last updated 6073716.8 minutes ago.

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What is the minimal number of weights required to be able to balance
all integer weights 1,2,...,40 on a balance scale?
Justify the minimality. 


Puzzle statistics "Weights".
Last updated 6073716.8 minutes ago.

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One more opening 
Chess puzzles 

Weight: 3 

Liked the puzzle: 100% 

24.12.2011 

Starting from the initial possition White and Black have done 4 moves each. What are these moves? Picture. 


Puzzle statistics "One more opening".
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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 6073716.8 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 mouse hunt 
Games puzzles 

Weight: 4 

Liked the puzzle: 100% 

11.01.2010 

A smart cat named Leopold is hunting a mouse. A mouse is hiding in one
of five holes arranged in a row. Leopold can reach into one of the
holes and try to catch the mouse. If he is not successful, the scared
mouse runs into a right/left neighboring hole. Is it guaranteed that
Leopold will catch the mouse? If so, what should he do? 


Puzzle statistics "The mouse hunt".
Last updated 6073716.8 minutes ago.

Solved by: 11
Daily average: 0
Answers submitted: 18
Viewed by: 290
Fraction solved by: 3.7%
Solved at first attempt: 54.5%
Average discussion length: 2.2
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Tictactoe, the Megamind style 
Games puzzles 

Weight: 4 

Liked the puzzle: 100% 

26.02.2011 

Two Megaminds decided to play tictactoe using new rules. They use a
regular 3x3 playing pad, but each player can choose to
place either an X or an O into one of the cells. The winner is still
the one who arranges three X's or three O's in a line. Is there a
winning strategy in this game? Which player has it? 


Puzzle statistics "Tictactoe, the Megamind style".
Last updated 6073716.8 minutes ago.

Solved by: 7
Daily average: 0
Answers submitted: 8
Viewed by: 56
Fraction solved by: 12.5%
Solved at first attempt: 71.4%
Average discussion length: 1.4
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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 6073716.8 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
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Ladders with missing steps 
Logic puzzles 

Weight: 5 

Liked the puzzle: 100% 

17.01.2010 

To fix his roof, Megamind needs to climb up a ladder. He has found many ladders to choose from, but unfortunately some of them were missing steps. Megamind cannot climb a ladder if it is missing two or more steps in a row. Originally, all ladders had N steps, marked bottom to top. How many different ladders can Megamind climb? 


Puzzle statistics "Ladders with missing steps".
Last updated 6073716.8 minutes ago.

Solved by: 9
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Viewed by: 284
Fraction solved by: 3.1%
Solved at first attempt: 77.7%
Average discussion length: 1.8
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The 40th anniversary tournament 
Algebra, arithmetic 

Weight: 5 

Liked the puzzle: 100% 

05.01.2010 

Once upon a time, grandfather Megamind told his grandchildren the following tale: On the 40th anniversary of their town, a soccer tournament was held in the central park. Five teams played with each other, 3 points were given for a win, and 1 point was given for tie. Each team earned a different number of points. The goal total was 40. But most curiously, a team placed higher scored fewer and gave up more goals than a team placed lower. Could such tournament really have taken place or is it possible that the old Megamind finally felt his age? 


Puzzle statistics "The 40th anniversary tournament".
Last updated 6073716.8 minutes ago.

Solved by: 6
Daily average: 0
Answers submitted: 14
Viewed by: 292
Fraction solved by: 2%
Solved at first attempt: 66.6%
Average discussion length: 3.2
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You are standing at the road fork. One of the two roads leads to your
destination, but you don't know which one. Fortunately, there is a
sentry guarding the intersection. Unfortunately, the sentry can be a
knight or a knave, moreover, he is a foreigner. He understands you,
but when he responds, he says "uhh" or "err" meaning "yes" or "no",
but you don't know what means what. He does not say anything else, and
he is standing at attention, not being able to point in the right
direction. On top of all this, the sentry is somewhat dumb, i.e. he
cannot understand sentences longer than 13 words. You may ask a single
question to figure out which way to go. Which question should you ask? 


Puzzle statistics "A foreign sentry".
Last updated 6073716.8 minutes ago.

Solved by: 6
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Answers submitted: 8
Viewed by: 293
Fraction solved by: 2%
Solved at first attempt: 100%
Average discussion length: 1.0
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