
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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Two incense sticks 
Logic puzzles 

Weight: 1 

Liked the puzzle: 100% 

27.12.2009 

You have two incense sticks, that burn unevenly, and a lighter. Each
will burn for an hour. How can you time 45 minutes using nothing but
these tools. 


Puzzle statistics "Two incense sticks".
Last updated 6329023.8 minutes ago.

Solved by: 41
Daily average: 0
Answers submitted: 53
Viewed by: 296
Fraction solved by: 13.8%
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Average discussion length: 1.1
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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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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 6329023.8 minutes ago.

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Daily average: 0
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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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 6329023.8 minutes ago.

Solved by: 37
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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 6329023.8 minutes ago.

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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 6329023.8 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. 


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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 6329023.8 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
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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 6329023.8 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
Liked the puzzle: 5
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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 6329023.8 minutes ago.

Solved by: 10
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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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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 6329023.8 minutes ago.

Solved by: 14
Daily average: 0
Answers submitted: 16
Viewed by: 273
Fraction solved by: 5.1%
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In a pet store, the first Megamind bought two plus a half of the remaining rabbits.
The second Megamind bought three plus a third of the remaining rabbits. The third Megamind bought four plus a fourth of the remaining rabbits. At some point, one of the Megaminds could not make his purchase. What is the maximal number of satisfied customers (Megaminds)?



Puzzle statistics "Rabbits in the store".
Last updated 6329023.8 minutes ago.

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Viewed by: 230
Fraction solved by: 1.7%
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For which values of n, the decimal number 10101..01 (the alternating sequence of n ones and n1 zeros) is a prime? 


Puzzle statistics "10101...01".
Last updated 6329023.8 minutes ago.

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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 6329023.8 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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