Valve Didn't Want Zombies In Left 4 Dead, It Turns Out

There really is no Left 4 Dead without zombies, but that's exactly what Valve's co-founder originally wanted.

Back 4 Blood proves Valve carried Left 4 Dead

As Left 4 Dead 2 turns 10, we speak to its creators about the Valve game that won't die

11 years later, Valve is updating Left 4 Dead 2

Valve Didn't Want Zombies In Left 4 Dead, It Turns Out

Left 4 Dead 2 - Wikipedia

Playable Left 4 Dead prototype sheds light on unique origin story

Valve Boss Gabe Newell Didn't Want Zombies In Left 4 Dead

As Left 4 Dead 2 turns 10, we speak to its creators about the Valve game that won't die

How creators of l4d did such a bad design of special infected? : r/Back4Blood

Faster Zombies to Steam Deck: The History of Valve and Linux Gaming