NPD Group Inc. this week said Krafton Inc.’s The Callisto Protocol ranked as a top-selling title in the latest domestic sales data.

In Dec. The Callisto Protocol ranked as the No. 17 best-selling software title based on dollar sales.

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.