CDKeys has The Callisto Protocol (PC/Steam Digital Download) on sale for $5.59.

Note, digital code will be delivered to you after purchase

About the Product

• The Callisto Protocol is a next-generation take on survival horror from the mind of Glen Schofield. Blending atmosphere, tension, and brutality with terrifying moments of helplessness and humanity, The Callisto Protocol immerses players in a pulse-pounding story where unspeakable horrors lurk around every corner