By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?
Replace the question mark with the correct number.
There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?
John asked Jack, "The time right now is 7 pm. Can you tell me what will be the time 23, 999, 995 hours later ?" While Bella does not know the answer, do you ?
Make eight squares by moving only two matchsticks. Note- Square can be of different sizes.
Which part of London exists in France as well ?
Can you solve this picture maths equation?
Which is the rope you never skip with?
Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation. Conditions: Each must be used exactly once and no other numbers or symbols can be used.
In the following series, a set of numbers is progressing with a particular pattern. Can you deduce that pattern and find the missing set? (2 + 6), (21 + 6), (58 + 6), (119 + 6), ___
What seven-letter word has hundreds of letters in it?
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.