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Video games developed by Key, a Japanese visual novel video game development studio and brand under the publisher VisualArt's, are initially published by VisualArt's and released for Microsoft Windows personal computers; consumer ports are published by Interchannel and Prototype. Key released their debut title, Kanon, in 1999, followed by their second title, Air, in 2000. Both Kanon and Air were initially released as adult games, but Key released their third game, Clannad, in 2004 with a rating of approval for all ages. Seven more games have been released since then. Thirty-eight versions of Key's 10 released visual novels have been published by VisualArt's. Of the 38, 11 were released with an adult rating, and the remaining 27 had a rating for all ages. VisualArt's has ceased manufacturing 21 versions of Key's 10 games. Key released a box set called "Key 10th Memorial Box" in July 2009 containing six of Key's visual novels with a rating for all ages. (Full list...)