# Questions tagged [logic-grid]

Logic grid puzzles, first produced by Lewis Carroll, are puzzles in which correspondences must be drawn between multiple ways of describing the same list of objects, using a given set of clues about these correspondences. Such puzzles can be solved using a grid, but for pre-existing grids whose elements must be filled using logic, use the [grid-deduction] tag instead.

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### Logical Reasoning - Seating Arrangement problem

Source P, Q, R, S, T, U, V and W are sitting around a square table in such a way that four of them sit at four corners of the square while four sit in the middle of each of the four sides. The ones ...
119 views

### Binary Grid Challenge and X & O Conundrum

You are given a 5x5 grid with some cells filled with either "X" or "O". Your goal is to fill the remaining cells with "X" or "O" following these rules: Each row ...
446 views

### 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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### Mr. Martin And The Mismanaged Airport Terminal

There is a small international airport in Greece. It has just 6 gates, lined up from 1 to 6 going away from the front desk. Tickets here only have the last names of passengers and gate numbers clearly ...
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419 views

### Beach Umbrellas puzzle: did I make a mistake or is Brainzilla wrong?

https://www.brainzilla.com/logic/logic-grid/beach-umbrellas/ has the following puzzle: Four families are going to the beach in the morning and are bringing their family-size umbrellas. Which family ...
262 views

### Find unique values for the variables to make all statements true

In this puzzle you have to find unique values for the variables to make all statements true. I have proceeded to here and now I seem to be stuck.
406 views

### Zodiac Signs at the Table

"And we find ourselves at another one of Ophiuchus' little themed puzzle dinners," you say while glancing at the other seven people. "I really like its puzzle dinners, honestly," ...
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### Logic in the Polycule

Heavily based on a puzzle from Brainteasers and Mindbenders. Eve's anniversary with her polycule is tomorrow, and she's bought presents for all of her partners. However, she stashed the presents in ...
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455 views

### Entry and Exit of people in pizza delivery shop

Similar problem at: https://brainly.in/question/38234304 Five people went to a pizza delivery shop at different times on a Sunday morning. They spent exactly 15 mins, 16 mins, 20 mins, 25 mins and 35 ...
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### Man of War: A Numbers Problem

The story is set in an alternate universe, where magic prevails. A man breathes heavily, muttering inaudible words while hunched over a spellbook. This person is a castle mage, tasked with determining ...
741 views

### Friends and Enemies

Here is a short puzzle I made: There are 10 people arranged in a row, and each of them has a friend and an enemy also present in the row. Your goal is to identify the friend and enemy of each person. ...
412 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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1 vote
249 views

### Does "The investigator traveled the same week as the thief." in a logic-grid clue mean that two different people are referred to?

I've always wanted to know if a certain thing was expressly allowed or disallowed in logic puzzles. Here's a specific example: The investigator traveled the same week as the thief. Does this mean ...
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627 views

### Is "Connect 4 is Excellent, Connect 3 is Great" a solved game?

Connect 4 is known to be a solved game. I am introducing the Connect 4 is Excellent, Connect 3 is Great, variant of Connect 4. Both players play like connect 4 and fill the grid i.e. they don't stop ...
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### My Master Piece Logic Puzzle Mystery

Six suspects for a bank robbery line up in front of you, with different nationalities, activities, occupations, suit colours and items. They all look nondescript to you, but you know someone holds a ...
259 views

### logical deduction - Persian Rugs - A Zebra Puzzle (Einstein's Riddle) Variation

You can play this Zebra Puzzle here: https://www.brainzilla.com/logic/zebra/persian-rugs/ Client #1 Client #2 Client #3 Client #4 Client #5 color name type symbols price place Five men, who ...
472 views

### Italian Exhibition - A Zebra Puzzle (Einstein's Riddle) Variation

You can play this Zebra Puzzle here: https://www.brainzilla.com/logic/zebra/italian-exhibition/ Woman #1 Woman #2 Woman #3 Woman #4 Woman #5 shirt name surname painter time age Five women are ...
3k views

### Need help with this ice cream logic puzzle

Disclaimer! I'm not looking for the answer, so no need to solve it. Just some help. In this website here I have tried many times to no avail. I don't know what I am getting mixed up on. So far I have ...
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### Bunk-bed Brothers

When we were boys, our mother, because of a shortage of living space, built for me and my five brothers -- Nortie, Matthias, Jack, Kenneth, and Lloyd -- a big, beautiful, sextuple-decker bunk bed. I ...
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622 views

### A streamer's diet

I'm in dire need of help. I've been hired to take care of a certain streamer during a charity event, but the instructions they gave me for meals and games are just, way too confusing! This one ...
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1 vote
322 views

### How to solve this North and South Sitting arrangement puzzle?

10 friends A,B,C,D,E,F,G,H,I,J are sitting in a row. Some of them are facing north while others are facing south. Not more than 2 persons facing the same direction sit together. They all have their ...
307 views

### Ernie and the Disguised Donors

I was spending the morning helping Ernie dig up the potato patch when he got an emergency phone call from the Society for Absent-Minded Mathematics Professors – it appeared that they had “A bit of a ...
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### How to solve sitting arrangement questions with 100% accuracy?

There are questions of sitting arrangement like persons sitting in a circular arrangement facing inward/outward or both, or a linear arrangement or box arrangement etc. Sometimes a few data points are ...
240 views

### Quickest chess stalemate with Queens exchange

Continuing my previous puzzle. If both players cooperate, what is the quickest stalemate in chess that includes a Queens exchange, in a legal game?
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### PSE Advent Calendar 2021 (Day 12): Christmas Confusion

This puzzle is part of the Puzzling StackExchange Advent Calendar 2021. The accepted answer to this question will be awarded a bounty worth 100 reputation.< Previous Door Next Door > Part 1: ...
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### Blood relations - who is married to whom and reads which magazines?

In a family of eight persons - P, Q, R, S, T, U, V and W - there are four males and four females. There are three married couples and two persons are unmarried. Each of them reads a different magazine,...
1 vote
4k views

### How to create a logic grid given three categories?

How do they make the three category setup here? I do not understand how this works. A detailed answer to this is most welcome.
2k views

### Reasoning puzzle involving five friends and five departments

Five friends A, B, C, D, and E are working in 5 different departments M, N, O, P and Q and they earn different salaries i.e. 10,000, 15,000, 20,000, 25,000 and 30,000 and they all are of different ...
263 views

### Logic grid puzzle - Carson City Chronicle

I can't figure this one out. Any help would be appreciated. Journalist-in-training Janet Seymour's byline appeared in the Carson City Chronicle on six days last week. On each day (Monday through ...
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### Books on a bookshelf

On a shelf the blue book is to the right of the red book, the yellow book is in one end, the black book is just before the white and the green is between blue and white. What is the order of the green ...
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949 views

### Nine neighbors in a hotel

Alessandra, Marta, Cristiane, Camila, Eduardo, Janice, Giulia, Mateus and Lucas are neighbors who live in a hotel. On each floor there are three bedrooms: one on the left, one in the center and one ...
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222 views

### Who took Gwen's purse and jacket?

The puzzle is as follows: Four sisters went to the movie theater. While leaving the venue each one of them took by mistake the purse of another sister and the coat of another different sister. Maria ...
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### Einstein's Puzzle with 5 furniture customers

Einstein had made quite a good zebra puzzle tough enough to confuse many people's brains. Today I present even tougher one, will you be able to solve it? There are 5 customers, who bought a different ...
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### Cheesemonger's puzzle

An entry in Fortnightly Topic Challenge #45: Flags The cheesemonger wants to arrange the wheels of cheese on display. The display case has two shelves with space for three wheels of cheese on each. He ...
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### An Artistic Bunch

Luke, Clive, Anton and Paul are four talented creative artists, one a dancer, one a painter, one a singer, and one a writer. (Though not necessarily respectively.) Luke and Anton were in the audience ...
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1 vote
135 views

### Who dances what musical genre and with whom?

The puzzle is as follows: 4 couples attended a magazine opening celebration party. These couples danced among themselves, all at the same time, to a disco suite, a pop ballad, a jazz tune and a waltz....
• 1,565
1 vote
185 views

### Teachers around a circular table - who teaches geometry?

The puzzle is as follows: In a teacher's lounge there is a circular table where the teachers eat their meals during lunch time. The teachers' names are Albert, Benny, Charles, David, Henry and Felix, ...
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261 views

### Asymmetric Logic-grid "Brentwood Puzzle": What are these people doing?

Three men, including Gianni and three woman, including Sachi are in line at the BrentWood post office. Each has two different pieces of business to conduct. The first person is a woman. Carlos wants ...
1 vote
328 views

### What numbers do they mean?

There are four nations using different types of numbers in mathematics. There are: Nation x: A, B, C, D Nation y: 1, 2, 3, 4 Nation z: i, ii, iii, iv Nation t: a, b, c, d They may not be the same ...
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289 views

### Whose story doesn't add up? (v3)

"It's been weeks. This is taking too long. We finally rounded up the four suspects - the four people seen ducking into nearby shops right around the time of death - got their statements and still ...
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### Whose story doesn't add up? [closed]

"It's been weeks. This is taking too long. We finally rounded up the four suspects, the four people seen ducking into nearby shops right around the time of death, got their statements and still ...
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1k views

### Logic grid puzzle with five FBI officers

My friend sent me this puzzle over Discord asking if I could figure it out. I tried for over an hour and I got pretty far but I've hit a bump. The puzzle goes as follows, There are five colored doors ...
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357 views

### Least number of marked symbols

I have a 7x7 grid, where I want to find the least amount of "marked positions" so a group of non-marked positions aren't bigger then 4 (only moving up, down, left and right and not diagonal)....
230 views

### Logic: Match the Potion to the Drinker

You are known as a great alchemist and potion master, and have spent the past decade developing a series of extremely powerful potions. You have made some great progress, but the potions are not ready ...
250 views

### The problem with the five farms

In the spirit of the so-called Einstein Riddle, I think everyone should try to create their own version. So here is mine: Five farms are next to each other along a country road (like in the next ...
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### What is Scenario One and Scenario Two?

(1) In Scenario One the L***** are S**** (2) In Scenario Two the L***** are not I****** (3) No C****** has the same type of people in Scenarios One and Two (4) The C**** in Scenario One and P***** in ...
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### Which city is the bus from?

There are four buses; their origins are the cities of A, B, C, and D. their destinations are the cities of E, F, G, and H. They park in a gasoline station in a line to get fuel. after a while, they ...
201 views

Four administrators (A, B, C, and D) from a company have written letters about four topics: Energy, Security, Nutrition, and Manpower. Each letter has a unique topic, sender, and receiver. Information:...