A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

You have to fill the below given grid in a manner that every row and column contains the digits 1 to 6. Also, make sure that the squares that are connected with each other must contains the same digit.

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

You need to arrange three 7 and mathematical symbols to form number 1?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?

Find the next number in the sequence

1, 2, 6, 21, 88, __?

Can you replace the question mark with the correct number?