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?
When it's bad luck to meet a black cat?
Arrange the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 above and below the division line in a manner that the thus formed fractions equal to 1/3. (You can use one number only once)
What has one eye, but can’t see?
Find the smallest sentence with all the English alphabet.
Replace the question mark with the correct number below.
Can you replace the question mark with the correct number?
Rearrange the letters in "new door" to make one word.
If you say my name, I will no longer exist. What am I?
Can you find out the missing number in the grid?
Outside a massage parlour, there is a board that reads "I only massage those who do not massage themselves." Reading the above statement, does the masseur massage himself?
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.
