"The Game Ratings Working Group, headed by Sega and Nintendo, was established in 1994 in opposition to the Entertainment Software Rating Board (ESRB) regime developed by the Interactive Digital Software Association (IDSA)."@en . "Game Ratings Working Group"@en . . "The Game Ratings Working Group, headed by Sega and Nintendo, was established in 1994 in opposition to the Entertainment Software Rating Board (ESRB) regime developed by the Interactive Digital Software Association (IDSA)."@en . .