
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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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 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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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 6942303.3 minutes ago.

Solved by: 41
Daily average: 0
Answers submitted: 53
Viewed by: 296
Fraction solved by: 13.8%
Solved at first attempt: 92.6%
Average discussion length: 1.1
Liked the puzzle: 11
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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 6942303.3 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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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 6942303.3 minutes ago.

Solved by: 20
Daily average: 0
Answers submitted: 22
Viewed by: 295
Fraction solved by: 6.7%
Solved at first attempt: 100%
Average discussion length: 1.0
Liked the puzzle: 9
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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 6942303.3 minutes ago.

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Viewed by: 296
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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 6942303.3 minutes ago.

Solved by: 15
Daily average: 0
Answers submitted: 16
Viewed by: 293
Fraction solved by: 5.1%
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Average discussion length: 1.0
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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 6942303.3 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
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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 6942303.3 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 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 6942303.3 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 game with coins 
Games puzzles 

Weight: 4 

Liked the puzzle: 100% 

12.03.2011 

Two Megaminds play a game: they have a regular round table and an unlimited
supply of identical round coins. Turn by turn, they place coins on the
table until someone can no longer make a move. The coins cannot
overlay each other, but they can touch. Who has a winning strategy
(and what is it) in this game? 


Puzzle statistics "A game with coins".
Last updated 6942303.3 minutes ago.

Solved by: 6
Daily average: 0
Answers submitted: 7
Viewed by: 38
Fraction solved by: 15.7%
Solved at first attempt: 83.3%
Average discussion length: 1.3
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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 6942303.3 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
Liked the puzzle: 2
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Four spheres and a cylinder 
Geometry puzzles 

Weight: 5 

Liked the puzzle: 100% 

26.01.2010 

Four spheres and an infinite cylinder are arranged on a plane so that all these solids touch each other and the plane. The cylinder has radius 1cm. Describe the spatial arrangement of these solids and find the radii of all spheres. 


Puzzle statistics "Four spheres and a cylinder".
Last updated 6942303.3 minutes ago.

Solved by: 3
Daily average: 0
Answers submitted: 5
Viewed by: 276
Fraction solved by: 1%
Solved at first attempt: 100%
Average discussion length: 1.0
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A poisoned chocolate bar 
Games puzzles 

Weight: 5 

Liked the puzzle: 100% 

26.12.2009 

A chocolate bar consists of NxM (at least two) square pieces arranged in a rectangle. The square in the upper left corner is poisoned. Two players break off the squares from the bar and eat them. If a player chooses a certain square, he must also take all of the remaining squares that have row/column numbers not less than the chosen one. A player forced to take the poisoned square loses. Prove that the first player to make a move has a winning strategy. 


Puzzle statistics "A poisoned chocolate bar".
Last updated 6942303.3 minutes ago.

Solved by: 8
Daily average: 0
Answers submitted: 13
Viewed by: 297
Fraction solved by: 2.6%
Solved at first attempt: 87.5%
Average discussion length: 1.6
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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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