WOW Entertainment was a development subsidiary of Sega created with members from an in-house Division titled Amusement Machine Research & Development Division 1 (AM1 R&D). Its name was changed to Sega WOW in 2003 when it was merged with another subsidiary, Overworks, before being shutdown and reorganized back into an internal Sega R&D Division structure after Sega's merger with Sammy in 2004.