Square Root 12345678987654321

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?




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Rockford immediately knew that the Lawyer has committed the crime. How?

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In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
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Can you find an "ology" that begins with a P?

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On a magical land of Mexico , all the animal in the land are rational.

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Three playing cards in a row. Can you name them with these clues? There is a two to the right of a king. A diamond will be found to the left of a spade. An ace is to the left of a heart. A heart is to the left of a spade. Now, identify all three cards.

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What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

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If two's company, and three's a crowd, then whats four and five ?

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There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.