What word begins and ends with an E, but has only one letter?
How many times can you subtract the number 5 from 25?
Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?
If a wheel has 54 spokes, how many spaces are there between the spokes?
What jumps when it walks and sits when it stands?
What have one eye but still cannot see?
What does the following BrainBat signifies? ABCDEFGHIJKLMNOPQRSTUVWYZ QQQQQQQQQQQQQQQQQQQQQQQQQ.
Without looking at a calendar, within a minute name, a boy's name using 5 consecutive 1st letters of 5 consecutive months
I don't get anymore wetter, no matter how much rain falls on me.
You Throw The Outside, Cook The Inside Eat The Outside, Throw The Inside. What Is It?
When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.