In yet another unexpected development from 2020, there’s a massive content update available for Left 4 Dead 2. Valve’s co-op zombie shooter was originally released in 2009, but the community is still active enough to produce a new content pack dubbed The Last Stand. There are new achievements, weapons and dialog, as well as “twenty new Survival Arenas, four Scavenge Arenas and a Campaign based on The Lighthouse Survival map.”

The Last Stand DLC is available for free to all players on PC, and even if you haven’t purchased Left 4 Dead 2 on Steam, the entire game is available for free this weekend so you can play it over the next three days. A changelog details over 1,000 tweaks, and if you’d like to keep playing beyond Sunday, the game is available for just $2.