The game has five regular game modes - Campaign, Singleplayer mode, Versus (where human players can take control of infected zombies and try to stop a regular group of the player-led survivors in a unique asymmetric online environment), Survival (a timed challenge), and Scavenge (multiplayer 4 vs 4 battles). The game promotes frenetic action in dark and dangerous environments, a large arsenal of weapons, tactical gameplay, a large number of aggressive zombies, and adaptive AI opponent (called AI Director 2.0) which dynamically reacts to the user behaviors, and procedurally spawns enemies, weapons and items based on players' performance. The game features five campaigns, each presenting between three to five smaller levels in which players must reach the safe zone before they are overwhelmed by zombie forces. If the game session is started without the full number of players, the in-game characters will then be controlled by a smart AI that will follow players and provide them with active support. The core gameplay element of Left 4 Dead 2 is cooperative gameplay with support to up to 4 active players. The wide array of technical and gameplay advancements has made this game into a celebrated cult classic that was since its release played by more than 10 million gamers from all around the world. Built on top of the award-winning frenetic gameplay of its predecessor, this cooperatively-focused first-person shooter manages to put players into an even more realistic and terrifying environment of the post-apocalyptic zombie outbreak, where a small group of survivors needs to fight against never-ending hordes of zombies and reach safety and the end of several large levels.

Left 4 Dead 2 (also known as the L4D2 game) is a multiplayer survival action game with a large focus on FPS action developed and published by Valve in late 2009.

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