Challenging brain teasers challenge your ability to solve the puzzles. They are not that easy to be solved.They require logical as well as conceptual thinking.

Here are some of them.

#741 - Difficult number sequence

Difficulty Popularity

What number would replace the question mark in this quite difficult number sequence ?

21 32 54 87 131 ?
category : SERIES

#742 - Very Hard Maths Riddle

Difficulty Popularity

Can you find the smallest positive number such that if you shuffle the digits of the number in a particular order, the shuffled number becomes twice the original number.
category : TRIVIA | MATHS

#743 - Calendar Date riddle

Difficulty Popularity

Date "13-1-13" (13 January 2013) is quite special.

The date speciality is that date multiplied by month is equal to Year.

You need to find, which year of this century have maximum number of such dates ?
category : LOGIC | TRIVIA

#744 - Count The Number Of Triangles In Figure

Difficulty Popularity

Can you count the number of triangles in the figure below ?

category : PICTURE

#745 - Find The Rebus Meaning Riddle

Difficulty Popularity

What does this rebus means ?

Your Your Your Your Your
Your Your Your Your Your
category : REBUS

#746 - Hard Rebus Riddle

Difficulty Popularity

What does the below rebus means ?

category : REBUS | PICTURE

#747 - Hard Rebus Puzzle

Difficulty Popularity

What does this rebus puzzle means ?

category : REBUS | PICTURE

#748 - What Word Problem

Difficulty Popularity

There is a five letter word which has 3 consonants(all are same) and 2 different vowels.
Also something wrong associated with the word.

Can you name it ?
category : WHAT AM I

#749 - Rebus Riddle

Difficulty Popularity

MOUNT MOUNT MOUNT MOUNT MOUNT
MOUNT MOUNT MOUNT MOUNT MOUNT

category : REBUS

#750 - Maths Algebra Equation Riddle

Difficulty Popularity

Can you get total of 720 by using six zeros 0,0,0,0,0,0 and any maths operators.
category : MATHS | EQUATION

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