# 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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### What can I next logically deduce in Day 62 of the Minesweeper Advent Calendar? (Fake 3D)

So I have gotten back into playing the Minesweeper Advent Calendars on heptaveegesimal.com, and recently came across the 2023 Minesweeper Advent Calendar. I am currently trying to beat Day 62, which I ...
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### The Devil's Shell Game

Inspired by the Skull Game in StoneStory RPG. You make a deal with the Devil. You are granted your deepest desire, in exchange, eventually, for your eternal soul. Every year, on your birthday, he ...
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### Lions vs. Pokémon

It is the year 10,000,000,000, and materalisation has been invented. At the same time, Nintendo has materialised every single Pokémon (countably infinitely many now!) to fight against finitely many ...
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Think of classic Minesweeper game, with the following list of restrictions on the placement of mines: C (Connected): All mines are connected via 8-way neighborhood (orthogonal and diagonal). Q (Quad):...
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### The Minesweeper Puzzle That Might Stump People

I thought this might be a different kind of puzzle. This is a game of Minesweeper that I played earlier today. All standard rules apply. For those who don't know, the number inside of each cell ...
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1 vote
223 views

### 5 guards, and get rid of the timer!

I like the lies and statistics question, but it is a bit too violent, so I suggest a (slightly harder) and way less violent version. You are looking at the basement of your house, and you see three ...
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### Tasks and activities for gifted students in the 6th grades for a course on problem solving and the use of diverse strategies [closed]

I am a teacher at a gifted center up to middle school grades, and I am looking for interesting tasks and activities for gifted 6th grade students for a course on problem solving and using varied ...
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### Continue a hard Loopy/Slitherlink puzzle without brute-force

This is a classic Slitherlink puzzle from Simon Tatham's Portable Puzzle puzzle collection. I was stuck at the position shown for quite a while until I found a way to continue by logical deduction. I ...
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### A Spelling Bee Champion And Some Bewildered Children

At this year's International English Spelling Bee For 10 Year Olds, the contest came down to four children. The judges decided to give each child two words to spell. No two children were given the ...
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### Murder Mystery. Who is the killer?

There is a riddle about a Murder Mystery. My friend, who is studying law, gave me this puzzle. It was originally given to him by his professor, who often gives puzzles to his students. There are 7 ...
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### Help with nearly finished expert sudoku

I just started with Sudoku and I jumped directly to a difficult level. I have a hint but don't want to use it. Please provide logic with your answer.
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### Happy and joyful 2024!

Fill each empty cell of the board on the left with a digit between 1 and 9. Each box and each column and row must contain all digits. The dots outside the board on the right indicate how many cells in ...
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### Variant on a Well-Known Card Puzzle

This is a variant on a well-known logic puzzle. It is not intended to be difficult, given that we are now officially in the “silly season”. Yesterday I won first prize in a Chess tournament, only to ...
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### Heuristic function for estimating nurikabe puzzle state

I am trying to write a program for solving nurikabe puzzle. I need a method to approximately represent the state of the game in one number, to choose the best way for the algorithm to continue. I can'...
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### Find the odd one out (at maximum one item) [closed]

This is a set (not series or sequence): x,y,z,x,z Which doesn't fit? We need the most basic and logical answer why the chosen item in the specified set doesn't fit in.
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### Decent Knights - Chess

In Naughty knights it’s asked to prove that it’s impossible to fit more than 32 knights such that no knight attacking other. Can you find the minimum number of knights, filling the table in a way that ...
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### The Island of Careful Thought

Everyone who lives on the Island of Careful Thought is either sane (believing all true statements, and no false statements) or insane (believing all false statements, and no true statements). The ...
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### Organising a tournament

In a table tennis tournament, there are 7 different tables and 10 players. Every player has to play exactly 7 matches (one match at each table). It's not allowed to play twice against the same ...
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### Looking for the name of a specific numerical logic puzzle. Involves swapping digits for shapes

I took an online assessment for a job and there was this really interesting section where you had to solve simple algebra problems, except the digits (not the numbers) were replaced by symbols. An ...
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### Wreck Exploration

This is part 48 of the puzzle series Around the World in Many Days. Each part is solvable on its own. Dear Puzzling, The larger grid here is a Takuzu puzzle (also known as Binairo). Fill the grid ...
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### How to beat Level 25 in Flip Palace?

Flip Palace is a minimalist game developed by 08jack where you flip into the walls and solve puzzles. The goal of Flip Palace (stolen from the description): flip into the walls, solve puzzles This ...
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### Naughty knights

Recently the British newspaper The Guardian published the following puzzle, titled Naughty Knights: And here's the solution published by the newspaper later: Unfortunately, this solution doesn't ...
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### PSE Advent Calendar 2023 (Day 20): Candles on the tree

This puzzle is part of the Puzzling Stack Exchange Advent Calendar 2023. The accepted answer to this question will be awarded a bounty worth 50 reputation.< Previous Door Next Door > Rules of ...
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1 vote
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### How do I do the Hard mode version of the 2nd bonus puzzle unlocked after beating level 45 in Hexologic?

In Hexologic, there are bonus levels that you can unlock after completing each 15 levels. (although it doesn't matter if it's on Easy or Hard mode) I have been able to complete all of the bonus levels ...
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