# 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).

25 questions with no upvoted or accepted answers
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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, ...
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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### Another type of Sudoku puzzle

I just found a weird-looking sudoku I left years ago in my basement: I think there was a specific name for this type of puzzle, but I forgot to write it down and now I can't remember it! The only ...
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147 views

### Logic and geometry problem 2

My question is whether or not a deadlock can occur in Crisscross. A deadlock is defined as a position, an arrangement of checkers, in which the board has been filled but neither player has won. ...
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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 ...
• 61
182 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 ...
• 161
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### Next Sudoku Number

Here is a sudoku puzzle coming from this magazine I found that B5 and B6 can only contain 6 and 7. 8 cannot be in B5 because D1 would be a 8 and neither B3 not C1 could be a 8. I thought it would help ...
260 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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441 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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### Filling in an 8x8 minesweeper grid with mines (Day 2: Diagonal Reverse Synesthesia)

Note: This is based off of Day 30 of the Minesweeper Advent Calendar on heptaveegesimal.com So my first minesweeper puzzle did not go so well. I will try to do better today. First off: This is a torus ...
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179 views

### Making a large Candy Crush unicolor box

I played the arcade game Klaxxon a lot (comparable mechanics to Candy Crush, long before the latter even existed) and always wondered if I could get a monster super ultra bonus by making a 3 x 3 ...
181 views

### In logic puzzles, can I rely on "or" to mean "exclusive or"?

Is there a common rule for logic puzzles on whether the word "or" should be treated as inclusive or exclusive? In computers, "or" is always inclusive. In common speech, it seems ...
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283 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|...
184 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 ...
1 vote
196 views

### Multi smol boi puzzle I: apologies

Disclaimer: Jryy, svefg bs nyy, V jbhyq yvxr gb ncbybtvmr. Abg sbe npgvbaf (jryy bxnl, sbe npgvbaf), ohg sbe zl fzby obv pvcure. Vg frrzf gung zl svefg fzby obv chmmyr jnf whfg n ovg gbb uneq. Fb, gb ...
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1 vote
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### Puzzle Challenge: Unraveling the the Circular Conundrum

Known are five numbers: 1, 2, 3, 4, and 5, arranged clockwise. The number after 1 is 2, after 2 is 3, after 3 is 4, after 4 is 5, and after 5 is 1. Whenever two adjacent numbers meet, it triggers a ...
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1 vote
135 views

### Circuissonne Diagrams

This puzzle is part of the Monthly Topic Challenge #7: Board games. And also, this puzzle is also a parody of XKCD's 730. We're starting a project on Explain XKCD (link currently not available) to ...
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166 views

### Sudoku variants #1: Schrödinger's Grave (6x6 grid)

Not in conjunction with my Minesweeper puzzles - that would be concerning! Inspired by Cracking The Cryptic's video "The Graveyard Of Schrödinger" (original gimmick by fjam) How this ...
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### Filling in an 8x8 minesweeper grid with mines (Day 7: Double Mines)

Note: This uses anti, single, double, and triple mines Yes, I realize that when I uploaded Day 6, I mentioned in the disclaimer that I planned for this to be released tomorrow, along with Day 8, ...
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183 views

### Logic puzzles: Flags and Stripes

Puzzle 1 Puzzle 2 Clues The only instructions given to solve this is that the answer can be alpha-numeric text. Ideas Puzzle 1: 3 flagpoles seem to have top-balls (called a truck), while 3 don't ...
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### Understanding solution for this puzzle where truth-tellers and liars describe game scores

Source (Page 26-28) Frieda was fond of visiting exotic locations. On her visit to the island of Yippiekaiyay, she was surprised that the natives of the island could be classified into one of two ...
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### 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 ...
268 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 ...