
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 6879001.6 minutes ago.

Solved by: 94
Daily average: 0.01
Answers submitted: 129
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Florida  n, New York  r, Texas  n, Washington  ? 


Puzzle statistics "States and characters".
Last updated 6879001.6 minutes ago.

Solved by: 18
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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 6879001.6 minutes ago.

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Answers submitted: 24
Viewed by: 257
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Solved at first attempt: 95.4%
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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 6879001.6 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 6879001.6 minutes ago.

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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 6879001.6 minutes ago.

Solved by: 37
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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 6879001.6 minutes ago.

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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 6879001.6 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 6879001.6 minutes ago.

Solved by: 37
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Viewed by: 291
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Solved at first attempt: 97.2%
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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 6879001.6 minutes ago.

Solved by: 14
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Answers submitted: 16
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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 6879001.6 minutes ago.

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Answers submitted: 4
Viewed by: 35
Fraction solved by: 8.5%
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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 6879001.6 minutes ago.

Solved by: 10
Daily average: 0
Answers submitted: 10
Viewed by: 273
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Solved at first attempt: 80%
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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 6879001.6 minutes ago.

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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 6879001.6 minutes ago.

Solved by: 8
Daily average: 0
Answers submitted: 15
Viewed by: 295
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Solved at first attempt: 75%
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A game with three dice 
Logic puzzles 

Weight: 5 

Liked the puzzle: 100% 

26.12.2009 

A MegaMind has three dice whose faces are marked with numbers 1,..,6. Some numbers can be repeated. He offers to play the game in which his opponent can choose any die, and the MegaMind will choose one of the remaining two. Then they discard the last die, and start rolling. Whoever rolls a lower number, pays the opponent a predetermined sum, say $1. In case of equality, the MegaMind lose. How did the MegaMind mark the dice if it is known that he plays this game nearly every day, and usually wins? 


Puzzle statistics "A game with three dice".
Last updated 6879001.6 minutes ago.

Solved by: 10
Daily average: 0
Answers submitted: 11
Viewed by: 296
Fraction solved by: 3.3%
Solved at first attempt: 90%
Average discussion length: 1.3
Liked the puzzle: 3
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