If you’ve always wanted to slay mutated hordes in the English capital then Steam’s weekend deal will scratch that itch. Killing Floor is a co-op multiplayer FPS that is essentially one giant horde mode where you and your team fend off against increasing numbers of mutated “specimens” before engaging in a boss fight. As you survive you earn cash that can be spent on improved weapons and perks allow you to customise your style of play in an understated and enjoyable co-op FPS. The Steam bundle includes all for the free maps that have been released including the character packs that allow you to expand your choice of playable character. If the character packs don’t interest you however you can find the main game cheaper than Steam at LoveFilm here.