Gone Home's free Commentary Mode adds more than 90 minutes of audio content to the game, and features voiceovers from developers Steve Gaynor, Johnnemann Nordhagen, Karla Zimonja, and Kate Craig. Additional commentary is provided by Sarah Grayson (the voice of Sam), composer Chris Remo, and Sleater-Kinney singer Corin Tucker, whose former band Heavens to Betsy is featured throughout the story.
The mode itself works similarly to Portal's commentary, and can be accessed via a series of clickable icons located throughout the Greenbriar's house. Explore thoroughly enough and you may shed some new light on the much-discussed Christmas Duck sidequest, among other juicy secrets.
For the next 48 hours, Gone Home is available for 50 percent off of its regular price on Steam and via its website.