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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22
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4answers
1k views

Art Accident at Airport!

There was an accident at the airport! A hanging art installation fell and landed on some passengers. In addition to tearing up all their tickets and mixing up their luggage, six people sustained ...
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1answer
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The Pirates of Beal Isle - very long logic grid puzzle

Story Let me tell ye a tale: Somewhere northeast o' the Bahamas there be a tiny scrap o' rocks stickin' up out o' the sea known as Beal Island. It be a barren, rocky place, and no man ever called it ...
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Which lorry is carrying drugs?

Five lorries are parked in a French layby, having recently come off the ferry at Calais. The police know that the lorry headed for Lisbon is smuggling drugs, but they're not sure which one it is. All ...
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1answer
762 views

Difference grid

Rule : A cross sign means one rectangle's number is the multiple of another one. A line sign means one rectangle's number is adjacent to another one. Example : The Puzzle : The numbers must be ...
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4answers
11k views

Fast strategies for solving Einstein's puzzles?

The Einstein's puzzle or zebra puzzle is a well-known logic puzzle. Are there any very easy ways to solve it fast?
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2answers
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How many clues are required to ensure Einstein's Puzzle is solvable?

I used to play Einstein's puzzles a lot when I was younger, and very quickly learned to assess quite rapidly whether I thought a puzzle would be a quick solve or more time-consuming, but I never ...
14
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1answer
415 views

The Roman Crypto

This was found engraved into a stone in Roman times: And underneath, an inscription: eoofrddene·en.do·xfrtfscqqiiut·iucraeiuioceaarriocsrt·s·ieaei,imt·oesa·serism?·,· Even with only this minimal ...
14
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1answer
452 views

Megan and the rambling reshuffle

When I met Megan the other day in Starpounds, she was not her usual calm self. "Goodness, what a shake-up! Everyone shifted from one job to another..." "The Cabinet reshuffle?" "Blithering ramblers!...
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3answers
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A Day at the Zoo

You find a note on your door when returning home. It tells you to check your email and find the hidden message. Upon inspection, there is a mysterious email in your inbox. From: ...
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11answers
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14 crosses in a 6 by 6 grid

Can you put 14 crosses in a 6 by 6 grid so that there are an even number of crosses on each row and column? An elementary school teacher asked me for help with this. Below is a photo of the book they ...
11
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1answer
3k views

Meeting Room - a harder variation of the classic Zebra Puzzle

You can play it online here: https://www.brainzilla.com/logic/zebra/meeting-room/ ...
11
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2answers
676 views

Fill the squares with the right tetrominoes

Fill the squares with the right tetrominoes, so each tetromino contains numbers 1 to 4. Example :
11
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1answer
3k views

Write digits 1 to 9 in the table, each pointing to next 3x3 grid

Write 1 to 9 digits in an empty Sudoku table with these rules (similar to 9-Queen problem): There are 9 Boxes indexed from 1 to 9 in the image below. and each box has a 3x3 grid child. Every two ...
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3answers
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My version of the Einstein Riddle

Below is a puzzle that I have created, with great inspiration from the Einstein Riddle. There are 5 houses, each house has one unique owner (for the sake of clarity, let's assume that the owners are ...
11
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1answer
391 views

What is the smallest rectangle containing the squares of 1 through 100?

Let us suppose that we have an $m\times n$ grid such that every element is a digit in base $10$. Then we can read the numbers from a grid such that we fix a starting element and go to one of the eight ...
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Athletes at the Rio Olympics

This is an entry in the 13th Fortnightly Topic Challenge. The little country of Asrius finally made it into the Olympics game! Yay! CROWD CHEERING!!! Five competitors from this country (Martin Fuis,...
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1answer
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How do I solve this logic puzzle?

I am trying to improve my logical thinking and I came across this puzzle problem. I need some help solving the puzzle below. Two weeks ago, four enthusiasts made sightings of objects in the sky in ...
10
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1answer
593 views

Girl Hackers - Logic Puzzle

StackExchange Top Ranked Girl Hackers The Stack Exchange Hacking Federation (of course fictitious) has just released its list of top-ranked female hackers for the year. Using only the clues below, ...
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2answers
2k views

When and where was the first logic-grid-based puzzle published?

Logic puzzles with a set of conditions and a "logic grid" are very popular. More than one publisher is currently producing puzzle books with these types of puzzles. A Wikipedia article claims ...
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1answer
242 views

Puzzling comes from within

People often say that the power to do things comes from within. In this puzzle, maybe I have taken that a bit too literally... I'm sure you will be able to find the sentence hidden inside this image. ...
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2answers
307 views

Adventure of LALO : Open the Stargate Portal

While exploring a remote island under the project "Search for Knowledge Program", Archaeologist "LALO" has found a hidden stargate which will open a portal to the Knowledge Dimension. In order to ...
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2answers
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Integer grid problem

I found this programming related problem too difficult for me. The problem asks to find 16 integers and form a 4x4 grid $$\left(\begin{array}{cccc} n_1 & n_2 & n_3 & n_4 \\ n_5 & n_6 &...
9
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1answer
321 views

A Grave Issue Discovered

In the town of Fairfield (There are 35 Fairfield's in America), there is a graveyard. In 1874, the mayor, Arthur Hither, declared that 25 new graves be created, in a square. Five years later, he was ...
9
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1answer
548 views

solving a logic grid puzzle

This is a puzzle from mysterymaster. Five students of twentieth-century literature (Oscar, Peter, Shirley, and two women named Ruth) elected to write their term papers each on a different work of ...
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1answer
299 views

How the snake laid down in the ground

This my puzzle is inspired by this puzzle. A sleeping snake has 36 consecutively numbered segments. It is hidden in a 6x6 gridded square ground. Each snake's segment fits exactly in 1 grid square. ...
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4answers
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Trick or Treating in Trutham-And-Ly

An entry in the 19th fortnightly challenge... Trutham-And-Ly, you may remember, is a small town in the north of Logistan. It is divided into two districts, Trutham and Ly, separated by a small stream....
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2answers
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Can you solve the 7x7 (sudoku-ish) centered sums puzzle

I have come across this puzzle a few times in competitions and rally's, and it has troubled me because I cannot seem to find a good approach to solving it, either programmatically or numerically. And ...
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2answers
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Find the Distance

The distances from you to some certain cities are written below: BERLIN 200 miles PARIS 300 miles ROME 400 miles AMSTERDAM 300 miles CARDIFF ??? miles ...
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2answers
522 views

Who owned each heirloom?

At the dinner party were Lady Winslow, Doctor Marcolla, Countess Contee, Madam Natsiou and Baroness Finch. The women sat in a row. They all wore different colors and Doctor Marcolla wore a jaunty ...
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2answers
645 views

Five Cousins Camping

Five cousins are camping together. Two are from Montana, and three are from Wyoming. Two are Pattersons, and three are Andersons. Irene and Yvonne are from the same state, while Michael and Emily ...
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1answer
2k views

Eight animals are sitting around a circular table

Eight animals named E, F, G, H, J, K, L and M are sitting around a circular table facing the centre. These are the kinds of the animals: Cat, Cobra, Dog, Elephant, Falcon, Llama, Panda and Sparrow (in ...
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2answers
529 views

Enlightened, Part II: A Curious Courtyard

If you care about the story, you may want to see Part I if you haven't already. Otherwise, just enjoy the puzzle! Ricky: Chris! Chris: What is it this time? Ricky: We have another problem. Chris: ...
7
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1answer
257 views

What two numbers need to be removed?

What two numbers need to be removed? The first one from the left circle, the second one from the right.
7
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1answer
199 views

A group of friends at a restaurant.

Four groups of four friends each are having dinner at a restaurant. There are four tables, table A, B, C, and D, seating four each, arranged in a square like so. A B C D Each table looks like this. ...
7
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4answers
519 views

'Companion Planting' Logic Puzzle - Is there an elegant solution?

Problem: You're a vegetable gardener planning to plant out seedlings in a new garden bed, however your farmer's almanac has outlined a system of rules about what plants can and cannot be placed next ...
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4answers
738 views

Logic problem about five thieves

The teacher of my nephew (15y) proposed the following puzzle to the students. I solved it, but I found it extremely difficult, in particular for teenagers. Perhaps there is a simpler solution than ...
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4answers
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5x5 statement table

Statement table. 3 2 1 4 1 2 3 3 3 3 3 4 6 4 4 2 3 4 4 3 1 1 2 4 3 Above 5x5 table contains numbers. A number at each cell represent a statement. x : This ...
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2answers
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Who killed Boggs? A chandelier’s view

Source: Condensed from "Murder Ink" by Dilys Winn Boggs has been found dead in the club lounge, his iced tea poisoned. Four men, seated on a sofa and two chairs in front of the fireplace, are ...
6
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2answers
203 views

Top Game Developers

Top Game Developers Back Story Okay fellow puzzlers, I hope you packed your lunch, this one is my most challenging puzzle to date... Johnny is writing an article about some of the top-selling ...
6
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1answer
352 views

Thieves and coffee

A thief has stolen people's coffees, and switched around the prices. Can you help the store manager? These people want a refund. Try to find out which person ordered which coffee, and the ...
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5answers
972 views

logic game - how would you solve it?

We had the annual team-building event last Thursday, and one of the activities involved solving the logic game/puzzle I transcribed below - which, as I just learned, is similar to the 'Zebra puzzle' ...
5
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1answer
1k views

Put numbers from 1 to 6 in the puzzle

Put the numbers from 1 to 6 in the puzzle in a way such that: In each row or column there shouldn't are no duplicate numbers. The squares that are joined together have the same number.
5
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1answer
135 views

A Tournament to Remember

The King: Recently we had a big tournament, worth being immortalized in the chronicles of my kingdom. Unfortunately, the court scribe misplaced the record of the final event, and we need to restore it....
5
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1answer
129 views

Video Game Auction - Logic Puzzle

Puzzle Difficulty: Very Challenging The Story Johnny loves his classic video games. He has collected most of them. Unfortunately, though, Johnny's Grandmother needs an expensive operation. He has to ...
5
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2answers
768 views

How to check a partial Einstein's-like-puzzle solution

John has started an Einstein's-like puzzle ("$n$ people of $n$ ages prefer $n$ foods, etc.; determine which is which from the following facts"), using a matrix for his work. He shows me his completed ...
4
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2answers
2k views

Cat Breeds - Logic Grid Puzzle

You can play this game here: https://www.brainzilla.com/logic/logic-grid/cat-breeds/ Also available as PDF here. Figure out the age and favorite food of four cats from different breeds. Each cat is ...
4
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1answer
982 views

Hardware Store - Logic grid, zebra puzzle style

You can play it online here: https://www.brainzilla.com/logic/zebra/hardware-store/ ...
4
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2answers
200 views

The CompuTaria Quest - A young Wizard's journey

Once Upon A Time In A Land FAR, FAR Away... Our adventure begins in the enchanted land called "CompuTaria". You are, "Binaryian" a 3rd year Wizard In Training. Today began like any other day - you ...
4
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2answers
249 views

Equivalent Grids

The two grids below are essentially equivalent. A specific color belongs to a specific catagory (four solid colors). Exception is the center box with 2 colors. Should be easy to fill out all the boxes ...
4
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2answers
146 views

Hidden Treasure Logic Puzzle

Ok, fellow puzzlers, here is my latest puzzle. They are getting progressively harder. Back Story While snooping around your grandpa’s attic, you came across a bunch of scribbled notes. They were in ...