OtherSide Entertainment, Inc. is a video game development studio founded in 2013 by Paul Neurath. It developed Underworld Ascendant (2018), a spiritual successor to the Ultima Underworld series, and is developing new titles including Thick as Thieves. The studio creates immersive simulation games that emphasize player choice and narrative. It maintains its main office in the greater Boston area with additional team clusters in Austin, LA, and Seattle. Key people include co-founder Paul Neurath and Warren Spector.