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+16 +1
100 Prisoners Escape Puzzle
In this puzzle there are 100 prisoners, each given a distinct number 1-100. The jailer has decided to give all the prisoners a chance to escape. He prepares a challenge, and if every single one of the prisoners passes, they are all free to go. If even one of them fails, they all die.
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+2 +1
Einstein's election riddle: are you in the two per cent that can solve it?
Nicola lives in the tartan house, but who owns the fish?
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+19 +1
Can you do the maths puzzle for Vietnamese eight-year-olds that has stumped parents and teachers?
All you need to do is place the digits from 1 to 9 in the the grid. Easy, right?
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+22 +1
This 'Simple' Puzzle Once Stumped 96% of America's Top Math Students
Twenty years ago, this puzzle appeared on a test administered to top-tier math students from 16 countries around the world. Only 10% of test takers got it right. In the U.S., only 4% managed to provide a correct response. Can you find the “simple” solution that so many intelligent students missed?
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+5 +1
Sunday Chess Problem
This week we have very clever helpmate from Russian composer Viktor Chepizhny, that was published in the November 2014 issue of The Problemist magazine. The diagram below calls for helpmate in two. There are two solutions: Recall that in a helpmate black moves first and cooperates with white to contrive a position in which black…
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+15 +1
Overthinking and Your Child-Like Mind
Consider the question in the image above. I found this spreading on Facebook the other day and it took me a few minutes to solve. Go on. Try. (If you want to know the answer. It's at the end of the article.)
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+9 +1
A Quick Puzzle to Test Your Problem Solving
A short game sheds light on government policy, corporate America, and why no one likes to be wrong.
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+1 +1
How wooden puzzles can destroy dev teams
Last week a mysterious double-sided puzzle appeared at Khan Academy.
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+17 +2
Can Information Rise From Randomness?
Quanta’s new puzzle column asks you to believe the seemingly impossible — that you can win at a number guessing game with absolutely no information.
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+14 +2
Circle Division Solution
An explanation of a neat circle puzzle involving combinatorics, graphs, Euler's characteristic formula and pascal's triangle.
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+1 +1
ThinkBox - Android Apps on Google Play
Instead of moving boxes on to specific locations, you need to arrange them into simple equations.
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-1 +1
Food Puzzles & Fun
Play with your food. Puzzles, Coloring In, Crosswords, Mazes, Dot-to-dots and more. Have fun with Allripe's free activities which help you learn more about food assessment.
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+1 +1
Assembler of boxes 99 level
Deft hands.
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+40 +4
Physics duo wins the Nobel Prize for solving longstanding neutrino puzzle
One of tiniest particles in physics has won the biggest prize in science – for the fourth time.
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+18 +4
... 01101101 01110101 01100101 01110010 01110100 01100101
01010100 01100101 00100000 01110001 01110101 01100101 01100100 01100001 00100000 00110001 00100000 01100001 11110001 01101111 00100000 01101101 01100101 01101110 01101111 01110011 00101110 00101110
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+23 +1
How to Solve the Hardest Logic Puzzle Ever
A step-by-step guide to True, False, and Random.
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+11 +1
Existential Riddles
Q: Which is heavier, a ton of feathers or a ton of gold? A: Everything is equal in a cruelly indifferent universe. By Ethan Kuperberg.
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+32 +5
Ready Player None
Talking to Jonathan Blow about his new game, The Witness. By Michael Thomsen.
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+4 +1
The Witness review
Big, beautiful and rewarding, Jon Blow's enigmatic puzzle epic is virtuoso game design - and only a fraction too clever for its own good.
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+21 +1
Elon Musk's favorite Riddle
I'm somewhere on earth. I walk one mile south, one mile west, and one mile north. I end up exactly where I started. Where am I? All of the solutions.
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