Left 4 Dead 2

Left 4 Dead 2 is a highly anticipated successor of the original L4D made by Valve masterminds who are responsible for such classic hits as Half-Life and Counter-Strike franchises, Portal and Team Fortress. The sequel didn't fail and introduced a whole new set of weapons both firearms and melee. Some of them were brand-new (like the famous frying pan) and others were remade and upgraded. The game continues the horror survival first-person shooter path and adds new tricks. The main thing is the improved AI Director 2.0 which can modify the level of difficulty, weather conditions, music settings, and enemy spawns as you play through. This instrument analyzes your in-game progress and either helps you out or brings your worst nightmares to life by sending hordes of bloodthirsty living dead on your way. Another feature is a new line of special infected zombies. These can't be taken down easily without team coordination. Speaking of teams, your friends can join in for five mindblowing campaigns or three game modes: Versus, Survival, and Co-op. Though L4D2 was released back in 2009, it's still relevant and on a par with any modern zombie FPS action game. An imaginative community of Steam Workshop constantly updates this game with new mods boosting its replayability.