 Proteus was released on 30 January 2013 for Windows and Mac , and on 8 April of the same year for Linux . When pre @-@ orders were open in 2012 , an Artifact Edition was also available ; a version which included a boxed version of the game with artwork , the soundtrack , and notes on the game 's development . Key apologised when the Artifact Edition was still in development and <unk> at the end of its release year , and offered to refund customers upon request . The Artifact Edition was released in July 2016 . 
