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On this Logic puzzle tutorial page we have examples and also links to free printable grid logic puzzles.

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By far the most popular of logic puzzles are the grid logic puzzles, though there are many other

varieties including word logic, maze logic, grid-less, syllogisms, and the like.

What most of the 'logic' puzzles have in common is that the game involves some form of

deductive reasoning., or that which we start with the general ( a set of clues) and move to the particular

( a logical conclusion) just like a real doggone sleuth!!

LOGIC PUZZLES:GRIDS

## LOGIC PUZZLES : GRIDS

Another form of logic puzzle, popular among puzzle enthusiasts and available in magazines dedicated to the subject, is a format in which the set-up to a scenario is given, as well as the object (for example, determine who brought what pet at a pet store , and on what day each pet was bought), some specific clues are given ("neither Mary nor Ray purchased the German Shepherd"), and then the reader fills out a matrix with the clues and attempts to deduce the solution.

Common logic puzzle magazines are derivatives of the logic grid puzzle called "table puzzles" that are deduced in the same manner , but lack the grid either because a grid would be too large, or because some other visual aid is provided. For example, a map of a town might be present in lieu of a grid in a puzzle about the location of different shops.

GRID PUZZLES - EXAMPLES

## GRID PUZZLES - EXAMPLES

In this section we will explore some grid puzzle samples in a step-by-step tutorial.

(NOTE: All puzzles in the example section are fully interactive , meaning

1. Using the grid charts below attached to each game to plot your guesses as follows :

2. Click on each grid square to alternatively :

• (a) make a 'green box' for a square, or
• (b) click again to make a 'red xx' ( for eliminating a possible clue).
• (c) NOTE: (A third click will clear a grid square completely )

3. Use the 'RESET' button to clear the entire grid chart and start a game over.

4. Click on the box labeled: SOLUTION Step_by_step to open the tutorial guide for the

selected puzzle.(Located beneath the reset button).

Puzzle 1: AT THE PET SHOP

Last week four friends ( one was Susan) went to the pet shop looking for new pets.

Each friend chose a different pet (one was a cat ).

From the clues provided can you tell which friend bought which pet?

Logic puzzle grid : TUTORIAL:EXAMPLE
AT THE PET SHOP Cat Dog Monkey Snake
Bill
Jen
Roger
Susan
EXAMPLES:TUTORIAL PAGE:PET SHOP1: SOLUTION

#### SOLUTION: STEP_BY_STEP-(click to show / hide)

• Lets look at the first clue "Nobody chose a pet which started with the same first letter as their name."

• Locate Susan in the chart and find the column with Snake

Now click the grid square(susan-snake) until the 'red xx' appears.

• Lets look at the next clue "Bill already has a dog."

• Locate Bill in the chart and find the column with Dog

Now click the grid square(bill-dog) until the 'red xx' appears.

• Lets look at the next clue "Jen is afraid of snakes."

• Locate Jen in the chart and find the column with snake

Now click the grid square(jen-snake) until the 'red xx' appears.

• Lets look at the next clue "Roger did not choose the snake."

• Locate Roger in the chart and find the column with snake

Now click the grid square(Roger-snake) until the 'red xx' appears.

• *IMPORTANT:*
Look at the column under 'SNAKE'. We have now eliminated 3 of the possible 4 squares in that column.

• Therefore the square bill-snake must be the correct solution

So click the grid square(bill-snake) until the 'green box' appears.
At the same time place 'red xx' in all other squares in the bill-row(bill-cat, bill-monkey).

• Lets look at the next clue "Neither Jen nor Susan like monkeys."

• Locate Jen and Susan in the chart and find the column with monkey

Now click the grid square(jen-monkey, susan-monkey) until the 'red xx' appears.

• *IMPORTANT:*
Look at the column under 'MONKEY'. We have now eliminated 3 of the possible 4 squares in that column.

• Therefore the square roger-monkey must be the correct solution

So click the grid square(roger-monkey) until the 'green box' appears.
At the same time place 'red xx' in all other squares in the roger-row(roger-cat, roger-dog).

• Lets look at the last clue "Jen did not choose the cat."

• Locate Jen in the chart and find the column with cat

Now click the grid square(jen-cat) until the 'red xx' appears.

This logically will conclude our puzzle as follows:
Since jen did not choose the cat, she could have only chosen the dog,
(jen-dog square should be highlighted with a 'green-box',while jen-cat is filled with a 'red xx').

The opposite is selected for susan, since she could have only selected the cat.

• Congratulations! Puzzle solved. To summarize:
Bill chose the snake.
Jen chose the dog.
Roger chose the monkey.
Susan chose the cat.
CLUE SNIPPET: Tutorial section:petshop1

#### CLUES:

Nobody chose a pet which started with the same first letter as their name.

Jen is afraid of snakes.

Roger did not choose the snake.

Neither Jen nor Susan like monkeys.

Jen did not choose the cat .

INCREASING DIFFICULTY :

## INCREASING DIFFICULTY

We believe the popularity of these types of puzzles is that the logic grid helps you keep track of the facts,

for me the grid itself is pleasing to my deductive mind, allowing me to keep track of the guesses,

the deductions from the given clues.

We can increase the difficulty by simply adding another variable or logic element to the mix.

For the next example we add the additional information to try to deduce not only what pet was purchased

by which person, but now you get to sleuth out the names of the chosen pets, as well..

Consider the next example.

Puzzle 2: AT THE PET SHOP AGAIN

Last week four friends ( one of whom was named bill ) went to the pet shop looking for new pets. Each friend chose a different pet (one was a monkey .) Each friend gave their pets a different name(one was named Spike ).

From the clues provided can you tell which friend bought which pet and the name they gave each of their pets?

Puzzle 2: AT THE PET SHOP AGAIN :TUTORIALS

AT THE PET SHOP-2

Cat

Dog

Monkey

Snake

Spike

Spot

Toto

Wobbles

Bill

Jan

Roger

Susan

Spike

Spot

Toto

Wobbles

CLUES:

1.] Roger's pet was not Wobbles .Bill already has a dog.

[ 2.] The girl who named her pet Spike is afraid of snakes.

[ 3.] Jan did not name her pet Toto, who is not a dog.

[ 4.] Bill did not purchase a cat, or a snake.

[ 5.] No pets name begins with the same letter as its species.

[ 6.] The cat was named either Spike or Wobbles.

[7.] Jan likes the name Wobbles and gave that name to the pet snake she purchased.

LOGIC GRID (with math)

My favorite variations are the logic grid with math, or using math.

Working with numbers not only gives your brain great exercise but it increases your brain

power as well ( see our Brain teaser section to find out more information)

Here is another great logic puzzle grid example

Puzzzle 3 :Arrivals-Departures

Arrivals/departures Interactive Examples

arr.-dep.

9am

10am

1130am

12noon

1:15pm

1:30pm

1:45pm

2:00pm

max

kathy

susan

1:15pm

1:30pm

1:45pm

2:00pm

Four travelers ( one of whom was Adam ) arrived at JFK all arriving at different times (one plane arrived at 11 am ) and also each departed at different times ( one plane left at 1:15pm ). From the clues provided can you tell which traveler arrived at JFK at what time and also what their departure times were?

CLUES:

The person who arrived earliest also left latest.

Max arrived sometime after Kathy, but before Susan.

Susan departed before Kathy, who departed last.

Adam's arrival time was exactly 2 hours before his departure time.

Max left exactly 15 min prior to Adam.

Again we will try to vary the difficulty of the puzzle by adding yet another element( The variation

in this puzzle will be adding a fifth person, ( up to this point all of our puzzles had been focusing on

simpler scenarios with only four persons).

Hope this logic puzzle grid will have a little more degree of difficulty for you.

Puzzle 4: Discovery

Five Scientists including Bob, have been credited with discovering five new planets ( one was named Argo )

at the Observatory last week (each on a different day including - Monday).If each scientist discovered his own

planet and each on separate days, from the clues provided below can you determine which scientist discovered

which planet and on what day?

planet logic grid puzzle on page example 4

PLANETS

Argo

Bargo

Fargo

Margo

Sargo

Mon

Tue

Wed

Thu

Fri

Bob

Carl

Edie

Igor

Max

Mon

Tue

Wed

Thu

Fri

CLUES:

Carl and Igor discovered their planets , Sargo and Bargo (in some order), on consecutive days, but not starting Monday.

Bob did not discover Fargo, which was discovered sometime later in the week, after Bob's discovery.

Argo was discovered before Bargo, but after Margo.

Edie discovered her planet the very next day after Bob's discovery, she did not find Margo.

Sargo was discovered last.

Carl discovered his planet 3 days after Bob.

The day of Max's discovery, Margo and Argo had already been found.

Fargo was discovered before Both Bargo and Sargo.

Max was available for work only one day last week, Wednesday.

WE ARE PLEASED TO ANNOUNCE OUR FIRST E-BOOK , A COMPILATION OF 'OUR BEST LOGIC PUZZLES' JAM-PACKED WITH OVER 80 LOGIC PUZZLES FROM OUR WEB-PAGES.

OUR BEST LOGIC PUZZLES (COMPILATION)

PICK UP THE E-BOOK VERSION HERE FOR ONLY \$4.99.

OR YOU CAN OBTAIN THE PAPER-BACK  COPY :   HERE FOR \$8.99 OR AT AMAZON.COM

- See more at: http://sbiapps.sitesell.com/sitebuilder/blockbuilder/preview/20005507.xml#sthash.QenVm26i.dpuf

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