Serious Sam 3: BFE has been updated with some serious holiday fun for a limited time!
The following will only be active from December 19 - January 5 so get serious while you can!
* A festive Christmas tree on each level - decorate them all with a Gnaar eye, Rocketeer heart, and Kleer skull to get a secret achievement and unlock the Reindeer Hunter outfit!
* Holiday gift boxes hidden through Serious Sam 3 that give health, armor, and ammo boosts!
* Decorative garland to bring some holiday cheer to the battle
UPDATED: You must use all three melee trophies on the Christmas trees to activate them.