Swarm Engine is a game engine developed by Saber Russia that the SnowRunner and Expeditions games are built on, replacing the VeeEngine used in previous games of the series and Saber3D engine used in previous Saber Interactive games.
Like its predecessor, it also utilises Havok physics engine to calculate the physics in the game as well as vehicle to terrain interactions. like the Saber3D engine, it uses custom PCT file format to handle texture files and PAK file format for file archives. both formats were originally created for Quake Champions game. The engine was originally developed for World War Z game and has been used since in all Saber Russia and Saber Armenia games, including SnowRunner, Warhammer 40,000: Space Marine 2, John Carpenter's Toxic Commando and Expeditions.