
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 




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 6579318.5 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
Did not like the puzzle:
0

An elevator button 
Logic puzzles 

Weight: 1 

Liked the puzzle: 87% 

12.03.2011 

A 12 story building has a single elevator. Two people live on the first floor, four  on the second floor, et cetera. Which button in the elevator is most frequently pushed? 


Puzzle statistics "An elevator button".
Last updated 6579318.5 minutes ago.

Solved by: 10
Daily average: 0
Answers submitted: 11
Viewed by: 38
Fraction solved by: 26.3%
Solved at first attempt: 100%
Average discussion length: 1.0
Liked the puzzle: 7
Did not like the puzzle:
1

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".
Last updated minutes ago.

Solved by:
Daily average:
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Viewed by:
Fraction solved by: %
Solved at first attempt: %
Average discussion length:
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0

Unusual purchase 
Logic puzzles 

Weight: 2 

Liked the puzzle: 85% 

14.01.2010 

Buyer: How much do you ask for one?
Seller: 20 roubles.
Buyer: How much for twelve?
Seller: That will go for 40 roubles.
Buyer: How about one hundred and twenty?
Seller: No problem, that would cost you 60 roubles.
What is the buyer asking for? 


Puzzle statistics "Unusual purchase".
Last updated 6579318.5 minutes ago.

Solved by: 38
Daily average: 0
Answers submitted: 41
Viewed by: 285
Fraction solved by: 13.3%
Solved at first attempt: 97.3%
Average discussion length: 1.0
Liked the puzzle: 6
Did not like the puzzle:
1

Two cubes and labels 
Logic puzzles 

Weight: 2 

Liked the puzzle: 91% 

19.01.2010 

You have two cubes and sufficiently many labels with digits
0,1,2,..,9. You have to place one label on each face of each cube so
that you can describe any day of the month. The days 1,2 .., 9 should
be described as 01,02,...,09. 


Puzzle statistics "Two cubes and labels".
Last updated 6579318.5 minutes ago.

Solved by: 34
Daily average: 0
Answers submitted: 35
Viewed by: 283
Fraction solved by: 12%
Solved at first attempt: 94.1%
Average discussion length: 1.1
Liked the puzzle: 11
Did not like the puzzle:
1

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 6579318.5 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
Did not like the puzzle:
0

A number pattern 
Logic puzzles 

Weight: 3 

Liked the puzzle: 60% 

05.03.2011 

What is next: 13 92 78 12 43 ... 


Puzzle statistics "A number pattern".
Last updated 6579318.5 minutes ago.

Solved by: 5
Daily average: 0
Answers submitted: 5
Viewed by: 47
Fraction solved by: 10.6%
Solved at first attempt: 100%
Average discussion length: 1.0
Liked the puzzle: 3
Did not like the puzzle:
2

A 52 card trick 
Logic puzzles 

Weight: 5 

Liked the puzzle: 100% 

26.12.2009 

A famous magician takes a standard 52 card deck and gives it to the audience. The spectators choose any 5 cards (they may do it any way they like) and pass these cards to the magician's assistant. The assistant announces 4 of these cards out loud. The magician responds by naming the fifth card. Except for the suit and denomination of each card, the assistant passes no other information to the magician. How does the magician "know" the fifth card? 


Puzzle statistics "A 52 card trick".
Last updated 6579318.5 minutes ago.

Solved by: 9
Daily average: 0
Answers submitted: 15
Viewed by: 296
Fraction solved by: 3%
Solved at first attempt: 88.8%
Average discussion length: 1.4
Liked the puzzle: 3
Did not like the puzzle:
0


A birthday dinner 
Logic puzzles 

Weight: 5 

Liked the puzzle: 0% 

26.12.2009 

A large and merry group of N guys and N girls went to celebrate a birthday in a restaurant. They were randomly seated at a big rotating table by a hurried waiter who quickly took their drink orders. Every girl ordered a wine, and every guys ordered a beer. Bringing the drinks, the waiter brought the right number of beers/wines, but forgot who ordered what and placed the drinks randomly in front of everyone. The party was enraged because more than a half got the wrong drink and demanded to see the manager. The manager appeared and said: "My apologies, but this is not such a big deal. In fact, I can rotate the table without touching the drinks so that more than half of you will get what you ordered." Is the manager's claim correct? 


Puzzle statistics "A birthday dinner".
Last updated 6579318.5 minutes ago.

Solved by: 6
Daily average: 0
Answers submitted: 6
Viewed by: 296
Fraction solved by: 2%
Solved at first attempt: 100%
Average discussion length: 1.0
Liked the puzzle: 0
Did not like the puzzle:
1

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 6579318.5 minutes ago.

Solved by: 9
Daily average: 0
Answers submitted: 14
Viewed by: 296
Fraction solved by: 3%
Solved at first attempt: 100%
Average discussion length: 1.0
Liked the puzzle: 5
Did not like the puzzle:
0

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