You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

Can you solve this tricky maths equation problem by replacing it? mark with the correct symbol?

19834 -----: 187
15921 -----: 153
17561 -----: 139
13734 -----: ???

What number do you get when you multiply all of the numbers on a telephone's number pad?

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

Why is the Hole below a Lock?

There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What colour are the stairs?

What is the unique property of the following words ?
* Revive
* Banana
* Grammar
* Voodoo
* Assess
* Potato
* Dresser
* Uneven

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?