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brain teasers
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.
How challenging are brain teasers
The difficulty of many brain teasers relies on a certain degree of fallacy in human intuitiveness. This is most common in brain teasers relating to conditional probability, This is different to other types puzzles, like Crosswords or Rubik's Cubes, which are not considered to be brain teasers, because they involve a lot of work with pencil and paper. Brain teasers are often categorized by their method of construction or by the skill required to solve them.