Founded in 2001 by Britney K. Brimhall and Christopher T. Warren as Tierra Entertainment, the group is best known for their remakes of the popular King's Quest games. AGD Interactive use Adventure Game Studio to create their games.
On December 10, 2003 , they stopped using the name Tierra Entertainment and started referring to themselves as AGD Interactive (AGD stands for Anonymous Game Developer). Subsequently, in their games, the two top designers (the two founders of AGD Interactive, that is) are credited as "Anonymous Game Designer #1" (Britney K. Brimhall) and "Anonymous Game Developer #2" (Christopher T. Warren). Of course, this doesn't imply actual anonymity, because their résumé, complete with all details, could be found in Himalaya Studios' "Team Profiles" page — which they had written themselves.
They have also formed a commercial company, Himalaya Studios, which will focus on creating original, point-and-click adventure games with high-resolution graphics.
Their first release was a critically acclaimed point-and-click remake of King's Quest 1: Quest for the Crown, released for download free of charge on August 8, 2001 . This remake is known as King's Quest 1 VGA In the month of its initial release sales of Sierra's official King's Quest VIII: The Mask of Eternity skyrocketed.
One year later, on December 3, 2002, they followed up with the release of their second free remake, a complete overhaul of King's Quest 2. This remake is known as King's Quest II+: Romancing the Stones KQ2+ won the 2002 AGS Awards for Best Game, Best Story, Best Animation, Best Music, Best Scripting, Best Documentation. Both games have been greeted by Sierra fans with enthusiasm, and consider these remakes almost equal to Sierra's later King's Quest VI.