Best-selling hack-and-slash videogame designer

According to Official Guinness Records,

The game designer who has produced the greatest volume of sales in the hack and slash genre is Hideki Kamiya (Japan), who created the Devil May Cry (Capcom, 2001) series and Bayonetta (SEGA, 2010), which combined have sole over 10 million units as of August 2010.
Featured in Guinness World Records Gamers Edition 2011

For a complete list of 2010 records, please visit 2010 Guinness Records in Japan.

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