Proteus is a 2013 exploration and walking simulator video game created and designed by Ed Key and David Kanaga for Microsoft Windows, OS X, Linux, PlayStation 3 and PlayStation Vita. It allows the player to freely explore a procedurally-generated environment, without predetermined goals. The world's flora and fauna emit unique musical signatures, combinations of which cause dynamic shifts in audio, based on the player's surroundings.
The game began development in 2008 under game designer Ed Key, joined by audio designer and composer David Kanaga in 2010. Key first conceived Proteus as an open-ended role-playing game akin to The Elder Scrolls IV: Oblivion; but, because of the work required for such a project, the team redesigned it to be "nontraditional and nonviolent". The PlayStation 3 and Vita versions of Proteus were developed by Curve Studios, whose team added extra features to the Vita edition at Sony's behest.