Raven Software has tweeted a mysterious image that could hint at the future of Singularity

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The tweet reads "We're going back," followed by the hashtag #Katorga12 -- a reference to the Russian island that served as the setting of Singularity. It also included the image below.If you're unfamiliar, Singularity was a Raven-developed first-person shooter released in 2010. Its story dealt with time travel, and the player could "rewind" objects. For example, a broken staircase could be made new again in seconds.This was the last full release from Raven before the studio began assisting with the development of various Call of Duty games, including Black Ops and Advanced Warfare. Founded in 1990, Raven is 25 years old this year.We have reached out to Activision for comment. We'll update the story when we know more.

Brian is an associate editor at IGN. You can follow him @albinoalbert on Twitter.