Serious Sam 4 is a 2020 first-person shooter developed by Croatian studio Croteam and published by Devolver Digital. It is part of the Serious Sam series and a prequel to Serious Sam 3: BFE. The game was announced in April 2018 originally as Serious Sam 4: Planet Badass was released in September 2020 for Microsoft Windows and Stadia followed by PlayStation 5 and Xbox Series X/S ports in December 2021. A standalone expansion Serious Sam: Siberian Mayhem was released in January 2022. As in other entries in the series Serious Sam 4 involves fighting against massive hordes of enemies in large areas. Enemies either attack close range or from a distance.