Questions tagged [logical-deduction]

A puzzle that requires formal logical deduction to arrive at the solution. This suggests more than merely reasoning through clues to find an answer (you might want [situation] for that).

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Is there a move-efficient way to rotate the center pieces on the Octo-Star?

I'm looking for a more efficient algorithm to rotate the center column of the Octo-Star puzzle 45 degrees. The situation below occurs when four properly-oriented edges are next to each other, ...
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9 votes
1 answer
2k views

Is there another name for this puzzle? (Kyudoku, Nine Find)

Is there another name for this type of puzzle? I can only find two examples of it online: https://www.brainzilla.com/logic/kyudoku/ http://ninefind.com/ In the game you start with a 6x6 grid filled ...
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6 votes
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Trying to find a 2020 puzzle hunt with a puzzle based on Among Us

I am trying to find a puzzle hunt that I believe was held in 2020. It contained a puzzle based on the game Among Us with 26 characters, and you had to decide who were the imposters. The imposters all ...
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6 votes
0 answers
165 views

Decoding a mystery sequence of falling boulders

I'm trying to unravel the algorithm for an old 1980s game called Wanderer. The game is a simple grid: 16 cells high (all visible in the image) and 40 cells wide (though not all are depicted). In the ...
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  • 161
5 votes
0 answers
236 views

The Jumbled Jaunts of Jormungandr

Jormungandr, the Snakebot of Doom has left New York. The world's armies and air forces have been decimated and cannot stop it. It has moved on from New York, and has flattened the following North ...
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3 votes
1 answer
278 views

A tough sudoku puzzle

Here is a tough sudoku puzzle from my blog
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3 votes
0 answers
264 views

Find a missing number in this 28x21 grid

355|066|677|855|677|081|044|855|355|062|216|677|216|855|224|044|034|046|051|677|355|264|044|046|044|351|886|043 043|044|886|357|886|352|225|357|043|222|993|001|233|968|046|225|062|041|351|886|043|227|...
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3 votes
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425 views

Logical descriptions of logic puzzles

What notations are there to describe a logic puzzle format? Here, I'm talking about logic puzzles like Sudoku, Bridges, Kakuro, Tents; games with exact rules and an exact & finite number of ...
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2 votes
2 answers
266 views

I'm not a robot, I'm not a MONKEY

The city of Roboville has been invaded by robots, monkeys, and dancers, who will dance if the beat's funky. Some of the invaders can be two of them (e.g. both monkeys and robots) and some can be all ...
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2 votes
0 answers
174 views

What is the Name of this Toggling Puzzle?

I came across an interesting toggling puzzle while looking through a code repository on GitHub. I want to find out more about it and see if there is any info on how to solve it, how to ensure ...
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1 vote
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159 views

A mysterious letter in the mail

The other day I got a letter in the mail.... It was a weird one, one that obviously boasts a puzzle. The Letter It states the following I like pigs, don't you? Won't you come and see the piggies with ...
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1 vote
2 answers
522 views

Her granddaughter is the only daughter of my brother

Pointing to a woman, Abhijit said, "Her granddaughter is the only daughter of my brother." How is the woman related to Abhijit? Sister Grandmother Mother-in-law Mother Source of the ...
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Find Out Our Numbers (liars and truth-tellers)

You are an adventurer to a distant jungle that the news told you it was full on secrets. But, you could not find anything! So you decided to head home. When you were almost there, a troll (you ca't ...
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0 votes
1 answer
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Word Arrangement Machine Problem

Input: All Indians Are My Brothers And Sisters Step I: 23 32 12 38 65 17 81 Step II: 30 70 41 156 328 104 568 Step III: 568 328 156 104 ...
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0 votes
1 answer
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The Truth And Lies Today: Revisited

A man is only capable of telling the truth four hours a day, and they are either TTFTT or TFTTT (equiprobable). On the other twenty hours, he lies. All hours between 7pm and 6am are night, 7am and ...
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118 views

Balance Puzzle Find at most 2 counterfeit coins out of anywhere from >=3 # of coins

2 fake coins from a pile of 30 coins The real coins all weigh the same, and the fake coins weigh the same. The fake coins weigh less than the real coins. The difference in the one I am trying to solve ...
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245 views

Reverse Engineering Computer Formula

A computer uses an unknown formula to create a 4 digit Output using specific Input. Here are 3 examples: Input = 20066 : 020470 : 47 : 1 : 322267 Output = 0927 Input = 20066 : 020470 : 46 : 3 : 198684 ...
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