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Some of the more well-known topics in recreational mathematics are Rubik's Cubes, magic squares, fractals, logic puzzles and mathematical chess problems, but this area of mathematics includes the aesthetics and culture of mathematics, peculiar or amusing stories and coincidences about mathematics, and the personal lives of mathematicians.
For amateurs, dan ranks up to 7th dan are available. Above this level, a player must become a professional player to achieve further promotions. In Japan and China, some players are awarded an amateur 8th dan rank as an honorary title for exceptional achievement. In the United States, amateur dan ranks are often based on the AGA rating system.
Of the nine arcade games that How to Win Video Games (1982) discussed, Pac-Man was the only one with women as a majority of players. [63] In response, the sequel Ms. Pac-Man, launched in 1981, featured a female protagonist. The success of Pac-Man led to more women pursuing video game development. [64]