Brain teaser: Can you crack the code and find the missing number in the triangle? Math puzzles have a special way of making even the sharpest minds stop and think.

The next four numbers, 1,9,3,7, contain two that are part of the code but not in the right places. The third row shows the numbers 5,2,0,1, but only one among them is the correct number and in the ...

A top secret science projectPlain: HELLO Cipher: EBIIL In order to decode your message, you need to share the “key” (the number 3) with your friend. After that you can send messages that are ...

Imagine a number lock with a three-digit code, and you're given five clues to crack it open. First, one digit is in the correct spot. Second, one digit is right, but it's in the wrong place.

Put your code-breaking skills to the test and see if you can beat the clock and open the safe in time. Each letter corresponds to a number, but the numbers associated with two of the letters are ...