Riddles Collection of 5000+ exceptional riddles, assured to make you think tough. A riddle is a statement or question or phrase having a double or veiled meaning, put forth as a puzzle to be solved. A brain teaser is a type of puzzle that is written or spoken, and which requires mental reasoning to solve. The distinguishing characteristic of a brain teaser is that the only thing required to solve it is your brain. Sometimes, a simple calculations or trivia knowledge is necessary, but generally a brain teaser only requires a brain.