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pretorik |
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markr |
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Gordon Weir |
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mbloomfi |
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97 |
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Dennis Nazarov |
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96 |
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zzz123 |
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72 |
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Srikanta |
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56 |
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lidSpelunker |
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SAMIH FAHMY |
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48 |
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jkr |
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44 |
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denisR, mishik |
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236 |
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alan, De_Bill |
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dddfff |
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kavfy |
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idler_ |
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106 |
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akajobe |
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94 |
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tolstyi |
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56 |
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STARuK |
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42 |
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vale |
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xandr |
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Place numbers 1,2,.., 9 without repetitions into a 3x3 square so that
the sums in all rows, columns, and diagonals are all equal. |
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Puzzle statistics "Numbers in a square".
Last updated minutes ago.
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Solved by:
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Links and chains |
Logic puzzles |
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Weight: 1 |
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Liked the puzzle: 100% |
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02.04.2011 |
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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 re-lock to make one long chain? |
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Puzzle statistics "Links and chains".
Last updated minutes ago.
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Solved by:
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Florida - n, New York - r, Texas - n, Washington - ? |
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Puzzle statistics "States and characters".
Last updated 5993228.2 minutes ago.
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Solved by: 18
Daily average: 0
Answers submitted: 22
Viewed by: 276
Fraction solved by: 6.5%
Solved at first attempt: 100%
Average discussion length: 1.0
Liked the puzzle: 1
Did not like the puzzle:
0
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There is true expression on panel. But only one pixel is defective. Which one?
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Puzzle statistics "Defective pixel".
Last updated 5993228.2 minutes ago.
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Solved by: 94
Daily average: 0.02
Answers submitted: 129
Viewed by: 294
Fraction solved by: 31.9%
Solved at first attempt: 94.6%
Average discussion length: 1.2
Liked the puzzle: 25
Did not like the puzzle:
0
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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? |
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Puzzle statistics "Two villages".
Last updated 5993228.2 minutes ago.
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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
Did not like the puzzle:
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? |
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Puzzle statistics "Milk, lemonade, water, and coke".
Last updated 5993228.2 minutes ago.
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Solved by: 19
Daily average: 0
Answers submitted: 21
Viewed by: 259
Fraction solved by: 7.3%
Solved at first attempt: 78.9%
Average discussion length: 1.4
Liked the puzzle: 4
Did not like the puzzle:
0
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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. |
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Puzzle statistics "Obtain 24".
Last updated 5993228.2 minutes ago.
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Solved by: 48
Daily average: 0.01
Answers submitted: 55
Viewed by: 296
Fraction solved by: 16.2%
Solved at first attempt: 87.5%
Average discussion length: 1.2
Liked the puzzle: 13
Did not like the puzzle:
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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? |
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Puzzle statistics "101 coins".
Last updated 5993228.2 minutes ago.
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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
Liked the puzzle: 4
Did not like the puzzle:
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. |
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Puzzle statistics "The fifth number".
Last updated 5993228.2 minutes ago.
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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
Liked the puzzle: 11
Did not like the puzzle:
0
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What is the minimal number of weights required to be able to balance
all integer weights 1,2,...,40 on a balance scale?
Justify the minimality. |
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Puzzle statistics "Weights".
Last updated 5993228.2 minutes ago.
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Solved by: 9
Daily average: 0
Answers submitted: 17
Viewed by: 274
Fraction solved by: 3.2%
Solved at first attempt: 100%
Average discussion length: 1.0
Liked the puzzle: 2
Did not like the puzzle:
0
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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? |
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Puzzle statistics "12 coins".
Last updated 5993228.2 minutes ago.
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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
Did not like the puzzle:
0
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A game of symmetry |
Games puzzles |
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Weight: 4 |
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Liked the puzzle: 100% |
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17.03.2011 |
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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? |
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Puzzle statistics "A game of symmetry".
Last updated 5993228.2 minutes ago.
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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
Liked the puzzle: 2
Did not like the puzzle:
0
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Six matches and triangles 2 |
Geometry puzzles |
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Weight: 4 |
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Liked the puzzle: 100% |
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07.02.2010 |
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How to make one equilateral and three isosceles (and not equilateral!) triangles using 6 sticks of the same length? Sticks cannot be broken and/or laid over each other and no free ends of the matches may be left. |
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Puzzle statistics "Six matches and triangles 2".
Last updated 5993228.2 minutes ago.
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Solved by: 5
Daily average: 0
Answers submitted: 15
Viewed by: 273
Fraction solved by: 1.8%
Solved at first attempt: 40%
Average discussion length: 2.2
Liked the puzzle: 3
Did not like the puzzle:
0
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Guess your color |
Logic puzzles |
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Weight: 5 |
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Liked the puzzle: 100% |
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26.12.2009 |
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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. |
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Puzzle statistics "Guess your color".
Last updated 5993228.2 minutes ago.
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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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A game with sums |
Games puzzles |
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Weight: 5 |
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Liked the puzzle: 100% |
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03.01.2010 |
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Two players play the following game. An even number of cards are arranged in a row. Each card is marked with a real number. Upon his turn, a player takes a card from either end of the row. Whoever collects the greater sum is a winner. Otherwise, a draw is declared. Which player is guaranteed not to lose? What is his strategy? |
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Puzzle statistics "A game with sums".
Last updated 5993228.2 minutes ago.
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Solved by: 6
Daily average: 0
Answers submitted: 7
Viewed by: 295
Fraction solved by: 2%
Solved at first attempt: 100%
Average discussion length: 1.0
Liked the puzzle: 2
Did not like the puzzle:
0
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Divide a parallelogram |
Geometry puzzles |
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Weight: 5 |
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Liked the puzzle: 100% |
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02.04.2011 |
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How to divide a parallelogram into 9 isosceles triangles? |
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Puzzle statistics "Divide a parallelogram".
Last updated minutes ago.
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Solved by:
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