The follow-up to last year's Left 4 Dead adds plenty more options in terms of weapons and enemy types. Players not only battle generic zombie hordes, but zombies with special powers. The Spitter, for example, spews acid. The addition of new weapons -- and especially the debut of melee items -- adds a greater level of variety to the action. The locales also feel fresh, taking players through various environments including an abandoned carnival and a shopping mall. While there are only five campaigns to choose from, there are plenty of modes available to enjoy, including Scavenge Mode, during which survivors must keep energy generators running while zombies attempt sabotage. Left 4 Dead 2 is also great at leaving the player feeling overwhelmed by throwing dozens of zombies in their direction. It's this kind of tension and thrill that makes it one of the year's best games for mature players.