Valve is celebrating Left 4 Dead 2's 15th birthday by making it free-to-play this weekend, alongside a massive Steam sale at the same time.

And according to the lead on the original Left 4 Dead, the sequel came so quickly because the first game was a “broken thing” that nobody at Valve wanted to continue working on.

Trippie Redd is "Left 4 Dead" on New Single: Though 'A Love Letter To You 5' is nowhere to be found.

Left 4 Dead veterans at Turtle Rock are working on a brand new game, and it sure sounds suspiciously like another Back 4 Blood game.

Videos by ComicBook.com Many long for Left 4 Dead 3 and various leaks over the years courtesy of files with Valve’s Source 2 engine has led people to believe it might be happening.

A former Valve writer that worked on Left 4 Dead, Portal, and Half-Life 2 has talked about how the game was often used as a testbed for ideas.

Is Left 4 Dead 3 coming to PS5? Here's whether L4D3 will release on PlayStation 5 or will be an Xbox exclusive.

An apparent leak of the source code for Counter-Strike: Global Offensive mentions Left 4 Dead 3, which has sent Twitter into a frenzy.

The latest bunch of Valve leaks have revealed the original map sources and prototype for the beloved and classic Left 4 Dead. We haven’t had any real news from Left 4 Dead or its developers ...

An early - and playable - prototype for Left 4 Dead has reportedly leaked online.

A playable prototype of Left 4 Dead has appeared online. A mod name Zombie_City reveals how the developer envisioned the hit zombie shooter.

According to ex-Valve writer Chet Faliszek, Left 4 Dead president and co-founder Gabe Newell didn't want to put zombies in the game.