This week’s freebies at the Epic Games Store are Arkane Studios’ interplanetary immersive sim Prey and Thunder Lotus Games' Viking ‘em up Jotun: Valhalla Edition. You’ll be able to nab them for zero currency later on today, but for now there’s still time to grab last week’s complimentary game, Terraforming Mars (which you can do here). Check the Epic Games Store at around 8am PST / 4pm BST for the changeover.