They Don't make games like this anymore.... Perfect and Fun Solo and Coop Mode, the Game was Released in 2009 which is 13 Years Ago but till this day the best zombie game ever made imo. This game is a true MASTERPIECE, I don't think any other zombie style game comes close to L4D2 in the base game version, let alone the mods you can add which make this game even more better because you can add countless stuff like Skins,Weapons,NewCampaigns etc, It's for this reason that this game will always stay relevant and never forgotten. If you haven't played it yet then you need to ASAP