The good news is, the Epic store version of the game is completely cross-play compatible with the Steam version.

While Killing Floor 2 was originally released in 2016, the game has continued to receive (often free) content. In speaking about the most recent update in the article linked above, David noted in the article on Xbox.com: “Over two years after launch on Xbox One, we’re still fully committed to listening to the fans and improving the game based on the top community requested features and tweaks. This update we took special aim at improving our Stand Your Ground optional objective to make it feel more rewarding and less punishing for the group as well as refining the Abomination Boss battle to bring it in line with our other bosses. Have a Happy Halloween everyone and see you all on the Killing Floor.”

The update went live December 4th and continues until January 18th, so now that Santa has had a chance to climb into his sleigh, now is your chance to hop in and slay. While the update does add some super fun additions (with a full list here) it also brings a number of tweaks and fixes, which is always a great stocking-stuffer alongside the gift of ultraviolence.

As with many of Killing Floor 2's updates, "HH:MM" adds a new map (the Monster Ball), seasonally appropriate makeovers for all the zeds, new cosmetics, new weaponry, new music, and a few limited-time items.  That's a lot of extra ways to spread the joy of All Hallows' Eve!  Credit to Tripwire, by the way, for continually finding new, inventive ways of making the zeds extra terrifying.

The "Killing Floor 2 - Summer Sideshow: Treacherous Skies Update" (which, for sanity's sake, will henceforth be referred to as "the update") is first and foremost adding a new map to the collection: Airship.  In it, players are working together to help Lockhart reach his home island by "completing a series of increasingly challenging objectives", punctuated by blasting waves of zeds into smithereens.  A new community map, called Endless Lockdown, has been added as well.

As with past seasonal events, the Zeds will look distinctly holiday-ish (sans the joy and cheer), and if players can survive their red-and-green onslaught, they'll get a chance to take down the aforementioned K-man.  All this takes place on a brand new holiday map, which features a "demented Xmas soundtrack".

Killing Floor 2 on any other month of the year would set you back $39.99, and with the price of PlayStation Plus being $59.99, this offer comes as one that is easy to recommend even if you are not a member just yet.

Here's all the new content you'll get in "The Descent" DLC: