Serious.sam.siberian.mayhem.merry.christmas.v1.... -

If you were specifically looking for features from the update (which arrived earlier in August 2022), it added: Guide :: Christmas event: XPMR "Freezer" Raygun weapon skin

: Introduced alongside the holiday content, this mode allows you to restart the campaign with all your weapons, skills, and gadgets while introducing tougher enemy spawns and weapon upgrades. Related Gameplay Improvements (v1.0.4) Serious.Sam.Siberian.Mayhem.Merry.Christmas.v1....

: The update adds Christmas-themed game menus, holiday music by Anna Lazarev and Ivan Špeljak Jitz, and festive enemy variants, such as Sirian Werebulls with glowing red noses and bosses dressed as Santa Claus. If you were specifically looking for features from

The Merry Christmas Update 1.06 introduced several holiday-themed and gameplay enhancements: and festive enemy variants

: A unique cosmetic for the XPMR "Burner" Raygun, unlockable by finding a Christmas Tree and completing a special portal challenge on each of the game's five levels.