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A puzzle is a thinking game that involves solving a problem, riddle or puzzle. It can take different forms and levels of difficulty, ranging from simple puzzles for children to complex puzzles for adults. Puzzles can be physical, such as wooden puzzles, Rubik's cubes or construction games, or they can be numerical, such as logic games and online puzzles. They can be based on geometric shapes, pictures, words or numbers. Puzzles can have different purposes, such as developing thinking, patience and perseverance, improving memory and concentration, or simply providing intellectual entertainment. Some famous puzzles include Sudoku, Nim's game, Sherlock Holmes puzzles, card games, crossword puzzles, mazes, and chess games. Puzzles can be used for educational purposes in schools, recreation centers, summer camps and game clubs. They are also popular as gifts and souvenirs.