Cygnus Entertainment was formed in October 2021 by Ken and Roberta Williams. Ken and Roberta Williams are best known as the founders of Sierra On-Line, a legendary publishing company founded in 1979 and ran for 20 years before retiring. During that time, Sierra On-Line dominated the industry bestseller charts releasing over 200 titles, including King’s Quest, Space Quest, Phantasmagoria, Ultima, Red Baron, Half-Life, and many others. In 2020, the Williams decided to re-enter the games business, creating Cygnus Entertainment. Their first product is a complete reimagining of the game that inspired Sierra On-Line, Colossal Cave.