A puzzle is a game, problem, or game that tests a person's ingenuity or knowledge. In a puzzle, the solver is expected to put the pieces together in a logical way, in order to arrive at the correct or interesting solution to the puzzle. There are different types of puzzles, such as crossword puzzles, word search puzzles, numeric puzzles, relational puzzles, and logic puzzles. Puzzles are often created as a form of entertainment but may also arise from serious mathematical or logical problems. In such cases, their solution may be a significant contribution to mathematical research.