In a time when shooters are competing to have the most modes, the biggest campaign, the most guns, and generally the most “stuff,” along comes Killing Floor 2, totally unconcerned with running that race. Its lack of modes and bosses will eventually turn away anyone but the most dedicated of fans, but its foundation is so fun and rock solid that, even if you only plan on playing for a few weeks with your friends, there’s plenty here to enjoy.