In order to solve a puzzle, a person is supposed to combine pieces in a logical way so as to obtain a predictable result.
Considering puzzles are not necessarily used for entertainment, teachers or parents can often resort to them when they want to encourage children to learn a certain topic.
Puzzle managers offer people the possibility to design custom layouts and to modify existing ones according to the difficulty level they prefer.
Alternatively, one can also solve the sample puzzles in order to improve their logics and patience.