According to KILLING FLOOR 2 developer Tripwire Interactive, post-launch updates are a "top priority" for the developer. The team at Tripwire has just released the Infinite Onslaught update, which adds a new endless mode, new weapons, a new playable character, two new maps, two new achievements and more.
Tripwire describes the new endless mode as "relentless waves of Zeds that become increasingly crushing as more waves are defeated while The Patriarch takes over in the role as The Trader." Players can also enjoy three new weapons with the update: the MAC- 10 SMG, which first debuted in the original Killing Floor, the Husk Cannon, and AF2011-A1 pistol. The newest playable character is the D.A.R., or Domestic Assistant Robot, another KF1 favorite. The new content can be enjoyed in combination with two new maps, DieSector and the community-created Powercore.
In addition, check out the Vault for a bunch of new cosmetic items. There are also two new achievements to be earned thanks to the update (update: According to commenters, you may want to hold off on working toward these as they do not appear to be live yet, even though the update is, and are not unlocking upon meeting the criteria):
The Infinite Onslaught update is live now for KILLING FLOOR 2.
We've got the full list of KILLING FLOOR 2 achievements - check the list for guides to unlocking them.
Check out our Best Xbox One First-Person Shooters Available in 2019 article for a compilation of other great games in this genre.
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