Platform
Digital
How Valve's Left 4 Dead almost didn't have zombies because of Gaben
Publisher Valve is synonymous not just with its Steam digital platform but also with its catalog of great games. While entries in the Half-Life and Portal series have revitalized the single-player aspect of the first-person genre, Left 4 Dead (L4D) did the same for co-op games. Valve's zombie-themed series is renowned for delivering atmospheric and tense 4-player-co-op romps against hordes of undead.