
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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A Megamind on his treasure hunt discovered a cave with six ancient
vases. Unfortunately, instead of treasures, the vases contained
beads. The first vase had 60 beads, the second had 30 beads, the third
had 20 beads, and the fourth had 15 beads. How many beads were in the
fifth and the sixth vases, given that these number form a certain
pattern? 


Puzzle statistics "Vases and beads".
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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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Florida  n, New York  r, Texas  n, Washington  ? 


Puzzle statistics "States and characters".
Last updated 6579363.4 minutes ago.

Solved by: 18
Daily average: 0
Answers submitted: 22
Viewed by: 276
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Average discussion length: 1.0
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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 6579363.4 minutes ago.

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Answers submitted: 21
Viewed by: 259
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Solved at first attempt: 78.9%
Average discussion length: 1.4
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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 6579363.4 minutes ago.

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A Megamind walked along a fence and discovered strange pairs of numbers. First, he saw "188>4". A bit farther, 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 the 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 6579363.4 minutes ago.

Solved by: 20
Daily average: 0
Answers submitted: 22
Viewed by: 295
Fraction solved by: 6.7%
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Average discussion length: 1.0
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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 6579363.4 minutes ago.

Solved by: 15
Daily average: 0
Answers submitted: 16
Viewed by: 293
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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 6579363.4 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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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 6579363.4 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 of symmetry 
Games puzzles 

Weight: 4 

Liked the puzzle: 100% 

17.03.2011 

Two megaminds play a game on a board sized 1x81 cells. The board is initially empty.
At each turn first megamind can place a stone (either black or white) in any cell. Second megamind can either swap any two stones or skip a turn. After megaminds made 81 turns each, the symmetry of the board is assessed. If the stones are located symmetrically, second megamind wins, if not  first one wins. Who will win and why? 


Puzzle statistics "A game of symmetry".
Last updated 6579363.4 minutes ago.

Solved by: 3
Daily average: 0
Answers submitted: 4
Viewed by: 35
Fraction solved by: 8.5%
Solved at first attempt: 66.6%
Average discussion length: 1.3
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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 6579363.4 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
Liked the puzzle: 5
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The telephone cable 2 
Geometry puzzles 

Weight: 5 

Liked the puzzle: 100% 

01.01.2010 

The Megamind has a square parcel of land of size 1x1 km. Accidentally, he has found out that the devious Occupants had buried a telephone cable through his land and use it for their devious communications. The cable is buried along a straight line crossing the square land plot. After discovering this, the Megamind got his shovel and... paused to think. What is the shortest trench that the Megamind has to dig to find the cable? The trench may be disconnected. The proof of optimality is not required. 


Puzzle statistics "The telephone cable 2".
Last updated 6579363.4 minutes ago.

Solved by: 8
Daily average: 0
Answers submitted: 15
Viewed by: 295
Fraction solved by: 2.7%
Solved at first attempt: 75%
Average discussion length: 3.6
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Guess your color 
Logic puzzles 

Weight: 5 

Liked the puzzle: 100% 

26.12.2009 

Three MegaMinds enter a room, one by one. Upon entrance, each MegaMind is given a hat that can be white or black. Each MegaMind can see the other two hats, but not his own. After they have spent 5 minutes in the room, the MegaMinds are separated and asked the following question: "What is the color of your hat?" They can say "black" or "white" or simply refuse to answer. If nobody answers or if somebody gives a wrong answer, they will spend the rest of their lives in a dungeon. What should each MegaMind do? What are the chances that they will be set free? There is no preliminary agreement or exchange of any information among them. 


Puzzle statistics "Guess your color".
Last updated 6579363.4 minutes ago.

Solved by: 9
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Answers submitted: 14
Viewed by: 296
Fraction solved by: 3%
Solved at first attempt: 100%
Average discussion length: 1.0
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Mad Max 2 
Logic puzzles 

Weight: 5 

Liked the puzzle: 100% 

29.01.2010 

A circular road in a desert is 100 miles long. Some finite number of barrels are placed randomly along the road. These barrels contain a total of 100 liters of gasoline, but otherwise each barrel contains a random amount of gas. A car takes 1 liter of gas per mile. Can Mad Max (the driver) travel the entire circle in either direction if his car has an empty gas tank? He may start from any barrel. 


Puzzle statistics "Mad Max 2".
Last updated 6579363.4 minutes ago.

Solved by: 5
Daily average: 0
Answers submitted: 7
Viewed by: 274
Fraction solved by: 1.8%
Solved at first attempt: 100%
Average discussion length: 1.0
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