## Sign Logic Puzzle

April 28, 2019 Leave a comment

Find a mistake. Think differently!

Find more logic puzzles for all ages in Think Outside the Box collection of puzzles.

Math and Logic Puzzles

April 28, 2019 Leave a comment

Find a mistake. Think differently!

Find more logic puzzles for all ages in Think Outside the Box collection of puzzles.

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December 1, 2018 Leave a comment

New challenges:

What is the easiest way to make it correct? Answer

In what Olympic sport does the winner cross the line facing backwards? Answer

What time is it? Answer

What is the necessary mirror size? Answer

Find all 18 best puzzles at

September 8, 2018 Leave a comment

The term “Boolean algebra” honors George Boole (1815–1864), a self-educated English mathematician. Boolean algebra captures essential properties of both set operations and logic operations. Boolean logic is credited with laying the foundations for the information age (computers and cell phones).

One of the puzzles on Boolean logic:

There are three balls X, Y and Z. They are colored red, white and blue, but not necessarily in this order. One, but only one, of the following statements is true:

X is red

Y is not red

Z is not blue

How many solutions does the puzzle have?

Think yourself before checking the solution.

August 5, 2018 Leave a comment

The picture shows a subway map. A team of inspectors verifies passengers’ tickets at a station on a line, or all lines through it if there are many lines. Then they randomly choose the next neighboring station and move there to make their inspection.

How many times higher is the probability of being inspected at station C than at station A?

Are you eager to know the answer? Try yourself before reading how Markov Chain helps to solve the problem. The answer is here.

The perfect explanation is given in the PBS Infinite Series video:

January 1, 2018 Leave a comment

Aplusclcik team chose 17 Best Puzzles of 2017.

They are:

What country has the lowest birth rate in the World?

If certain words in this question are spelt wrong, how many of the eighteen words are spelt wrong?

A claustrophobic gentleman chooses his place in the train that will enter a tunnel just after the station. Where is the best place for him?

Read more at

May 7, 2017 Leave a comment

Why we frequently use number 7?

Why there are seven days of week? seven deadly sins? seven wonders? . . . .

Look for the answer in the night sky or at aplusclick.org

March 4, 2017 Leave a comment

*Mary has a cat, and a rat, and a hat, and a mat.*

**If the cat is on the mat, and rat is in the hat, but the hat is on the mat, where is the rat?**

This is a simple puzzle asked by Leslie Green, who collects dozens challenging puzzles. The collection of Leslie Logic and Math is presented at the website Aplusclick. It’s worth to try the challenging questions.