GfK Chart-Track this week said Krafton Inc.’s The Callisto Protocol ranked as a top-selling title in the latest sales data from the UK.

For the week ending Dec. 3, The Callisto Protocol ranked as the No. 6 best-selling boxed software title.

Developed by Striking Distance Studios, The Callisto Protocol is a third-person survival horror title in which an inmate must escape Black Iron Prison.

The final game includes shooting and close-quarters combat.