It’s actually two games, and I’m not sure which to call the main event. I know which one I prefer, because the story mode is a love letter to Half-Life 2, complete with Bane-muffled jackboot cops, endlessly catching up with a Story Guy who’s inexplicably ahead of you again, a bionic arm standing in for the gravity gun, and a spooky dark underground section where you’re swarmed by creepy mutants. It was good enough to tempt me this week, despite a few minor niggles, but its other half, Zone Patrol, is a Stalker-esque sandbox where it really shines.