81 x 9 = 801. What must you do to make the this equation true?
Find the next number in the series? 2, 12, 36, 80, 150, 252, 392, _ ?
What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?
Can you find the missing piece of the Porsche?
If, 6 / 7 = 2 3 / 9 = 7 8 / 2 = 6 Then 4 / 5 = ?
Find the Next Number in the Sequence 2 9 3 1 8 4 3 6 5 7 ?
Which is heavier: a ton of bricks or a ton of feathers?
Which letter of the alphabet has the most water?
Can you find a number that lies one third of the distance between 1/3 and 2/3?
There are forty elephants and they have forty-fore heads. How can this be possible?
Distances from you to certain cities are written below. BERLIN 200 miles PARIS 300 miles ROME 400 milesAMSTERDAM 300 miles CARDIFF ??? miles How far should it be to Cardiff ?
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.
