# 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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### 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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### Filling in an 8x8 minesweeper grid with mines (pt. 1: Rectangle)

Can you detect where the mines are in this 8x8 Minesweeper grid containing single, double, triple, and anti-mines? 1 3 4 -1 21 5 3 1 9 3 -1 3 -5 -4 -3 13 4 5 20 12 5 5 Notes: Anti-...
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### A compact grid of squares

Given the information below, connect the red point to one of the four corners of the grid, with exactly six moves. Each move ends on a unique point Each move, except two consecutive moves, are unique ...
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My friend from America was going to watch a game and wanted to bet I couldn't guess where he was going. The answer lies in the Quadritaisho puzzle below. Can you help me find out where he's going to ...
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### How did the students figure this out?

A Logician meets with five of his new students. These students have never met before and do not know each other's names. The logician goes to the board and writes all their names in random order. SAL ...
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### Help me with Slitherink puzzle (honeycomb) solution

I got stuck on this level (Honeycomb/Large/Hard/#12) and I always end up having issues with the part that I circled with red because it either wouldn't add up or there would be a space that's not ...
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478 views

TL;DR: Nikoli's Tentai Show, but with four different types of symmetry. Rules of Quadritaisho: Divide the grid into rooms by drawing borders along grid lines. Each room contains exactly one symbol (...
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### Temple of lost memories: raiding the circular chamber

In the center room of an ancient temple, there are $n$ identical chests. Of these, $k$ contain treasure, but the other $n-k$ contain mind erasers. You do not know $k$. If you open a chest with a mind ...
1 vote
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### 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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### Max/Min points in Tournament

A round-robin tournament with 10 people. Find the maximum possible points for second place Find the minimum possible points for second place Find the maximum possible points for second last place ...
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### How to remember without writing, a subset of 1000 numbers [closed]

P has a secret number which is between 1 and 1000 (both inclusive). Q tries to guess the number by speaking out random numbers one by one. R has to keep track of all the numbers that Q has spoken. An ...
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### A Trivial Pursuit #19 (Geography 4/4): Glass

This is part 19 of A Trivial Pursuit, a 25-part puzzle hunt. Each part is solvable on its own, with the exception of the meta-puzzle at the end. Front of menu card: STIV'S SPEAKEASY COCKTAILS BOUR....
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### SlitherLITS revisited - Do colour outside the lines

This is a follow-up to SlitherLITS: Don't colour outside the lines After creating that puzzle, I've been wondering whether it was possible to create a SlitherLITS puzzle where all the regions outside ...
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### An anagrammed logic puzzle!

ot rleow utbrctsa aacpilt hwti dioiatdn het ryuo s-bcBPEFfJDfeFmksmPOkChDhrgBqjD-i---ffeNB
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### Playing Mastermind against an angel and the devil

This puzzle is based on a card game. There are 7 suspects and 3 of them committed a crime. The game contains 35 cards that contain the 35 possible choices of 3 out of the 7 suspects. One card is drawn ...
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### Colourful Scenery

This is part 41 of the puzzle series Around the World in Many Days. Each part is solvable on its own. Dear Puzzling, This is a Word Nurikabe puzzle. Shade some cells in the grid. Shaded cells must ...
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### A Trivial Pursuit #12 (Sports and Leisure 2/4): Logic Boat

This is part 12 of A Trivial Pursuit, a 25-part puzzle hunt. Each part is solvable on its own, with the exception of the meta-puzzle at the end. This is a variation on a Battleships puzzle, where the ...
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1 vote
225 views

### Logic and Geometry Problem #5: does Savage Go have cycles?

My question is whether or not a cycle can occur in the game of Savage Go. That is, you kill some of mine, I kill some of yours, you kill some of mine... Endless cycle of turns. Game never finishes. No ...
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### Very small regional Yajilin

This puzzle is part of the Monthly Topic Challenge #14: Think inside the (very small) box!. Rules of regional Yajilin: Shade some cells in the grid. Two shaded cells cannot share an edge, but can ...
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### SlitherLITS: Don't colour outside the lines

This puzzle is part of the Monthly Topic Challenge #13: Variety Slitherlinks. Adding a bit of colour to enhance the loopy goodness of a traditional Slitherlink. Draw a single, non-intersecting loop ...
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### How to solve large "crack the lock" questions

I already have the solution for this crack the lock puzzle but am stuck on how to get there. The smaller puzzles I've solved use a different style of deductive reasoning. Rules: For this specific ...
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