Serious Sam Siberian Mayhem

Serious Sam: Siberian Mayhem is a co-developed standalone expansion from Timelock Studio and Croteam, set in the wild lands of Russia as Sam Stone chases General Brand across five new levels. The landscapes range from Arctic coastlines to desolate forests, abandoned villages, and a chilling ghost town — each large enough to support both the series' signature horde combat and meaningful exploration.

The arsenal expands with new weapons including the legendary AK and the experimental Perun crossbow, plus new gadgets and vehicles that range from death-from-above options to 50-ton ground vehicles designed for first-class firepower. The enemy roster adds advanced and intimidating creatures alongside the familiar Mental's Horde, including a set of new bosses calibrated for the colder, larger maps.

A cast of new outcasts and unexpected characters joins Sam along the road to Tunguska, with side missions that flesh out the chronicles the wild Siberian landscape carries. Siberian mysteries — useful, silly, weird, or familiar — sit scattered across the maps, rewarding the kind of exploration that traditional Serious Sam corridors never asked for.