Serious Sam: Siberian Mayhem is a 2022 first-person shooter game developed by Timelock Studio and Croteam, and published by Devolver Digital. A standalone expansion to Serious Sam 4, the game was released on 25 January 2022 for Microsoft Windows, and on 6 October 2022 for PlayStation 5 and Xbox Series X/S.
Serious Sam: Siberian Mayhem is a standalone expansion to Serious Sam 4.[1][2] The game features five levels and several new weapons.[2]
Serious Sam: Siberian Mayhem takes place in Russia, somewhere in deep Siberia. The events occur in the alternate universe of Serious Sam 4, between two of the last levels from the main game.
Departing on a boat from oil rig «Stormbringer», Sam Stone arrives at north coast of Russia, aiming to reach Tunguska and stop General Brand, who took possession of the Holy Grail. Having got out on the mainland, Sam gets into the land oil rig and finds a radio. The protagonist attempts to contact the HQ, but the radio breaks down. Stone notices an oil refinery complex in the distance and a light signal SOS from someone on a high tower. After Sam enters «Stormbringer» refinery filled with alien invaders, he is contacted by someone who is surrounded on a communications tower. Stone reaches the tower and meets a survived refinery employee, however gets no chance to save him - the man is killed by Draconian Burner. Having dealt with the enemy, Sam climbs the communications tower and hears a radio transmission from Igor Ledov, the head of the local partisan squad. Igor is aware of Brand's betrayal and appeals to all armed human units to shoot their plain on sight. Ledov offers Sam their help and asks the hero to go to the village Kalinovka in southern Siberia, where the squad will be waiting for him.
After getting out of the «Stormbringer» refinery, Sam finds a snowmobile and sets off. Meanwhile, Russian soldiers of Earth Defense Forces locate Brand's plane and shoot it down. Stone travels the Siberian plains and forests, clearing out alien outposts. In one of the villages surrounded by Octanian troops, Sam meets with One-Eye Olga, a legendary Russian sniper who was believed to have been killed during the storming of the portal in Tunguska. It turns out that Olga was shot by enemy soldiers and faked her death, hiding in an abandoned church in the meantime. Sam and Olga fight together against approaching enemy forces, then the girl gives the protagonist a «Perun» energy crossbow as a farewell gift.
Serious Sam continues his journey through Siberia and soon reaches Kalinovka. There he meets Ledov's partisan squad: the stern and dense Ivan, the energetic and militant Natasha, the silent Vlad and the leader of the group himself, the former rock musician Igor. Ledov tells Sam that there is a former railway depot on the outskirts of the village, where a working locomotive is present. They can use the train to reach the closest town Ustinov and reach Tunguska from there. He also gifts Sam with a new weapon, «Burner». Sam with his new comrades gets through Kalinovka and reach the depot. While Natasha and Vlad are preparing the train for departure, Sam with two of the rest partisans clear the depot and help to pick up the equipment wagons. Finally, having beaten off significant enemy resistance, the heroes board the train.
On the way, the heroes enjoy Ledov's songs and reminisce about gone Father Mikhail. Soon, the train arrives at the Ustinov station. Ledov says that the squad has to go through the town and reach the hydroelectric dam, in order to raft from there in boats to the mouth of Tunguska river. Sam with the squad fights his way through the town filled with Mental's troops and stumble upon the remains of another partisan group, in which Ledov recognizes a squad of certain Pavlov guy. Someone or something dealt with these people with unprecedented cruelty. Sam suspects something is wrong, but does not have time to finish: Octanian raiders start bombing the city, undermining a nearby building. Sam and the guerillas run in opposite directions, and when the dust and explosions clear out, General Brand himself, in his monstrous form, suddenly appears on top of the collapsed building remain. He grabs Ivan and tries to convince Sam to join Mental in exchange for the partisans lives. Ivan harshly dissuades Sam and pays for it with his own life: disgruntled Brand tears the man to pieces. Sam and the rest of guerillas recover from the shock and open fire on the traitor, but he manages to escape.
Partisans in rage decide to get to Brand by all means and avenge the death of their comrade. Sam tries to dissuade Ledov and his people, but those, cut off from Stone by the ruins of a collapsed building, act in their own way and set off to intercept Brand on the dam. Left alone, Sam decides to get to the HPP by a detour. On the way there, he tries once again to contact his friend on the radio, but they cut off the communication. Finally, getting out of the city and reaching his destination, Sam sees a terrible picture: the enemies surrounded the squad, Vlad and Natasha are dead, and Ledov holds the last defense. Seeing Sam, Igor tries to stop him, shouting that this is a trap, but he does not make it in time: Brand jumps out of the ambush and throws Sam down. Meanwhile, the enemies knocked down Ledov and surround him. Exhausted and wounded, Igor grabs the C4 detonator in a last rush and blows himself up along with the aliens.
Sam, thrown into the water, swims up to the platform under the dam and starts a fight with Brand. In the process, the traitor stabs himself with the Grail, absorbing the whole power of the artifact, and turns into an even more frightening creature, but this still does not help him. During the battle, Sam kills the traitor without any regret. After that, a time portal suddenly appears in front of the hero, from where emerges Sam from the future. He says that killing General Brand in this timeline will lead to even more sad outcome for the Earth. One-Eye Olga also walks out of the portal and reports that she has killed Napoleon, but this did not affect the future in any way. Future Sam says that he just wanted "someone to shoot that little twerp", and offers present Sam and Olga a new mission, to go to 1352 BC, where Pharaoh Akhenaton has just discovered a buried Sirian ship. The three of them go through the closing portal, and game credits roll.
The post-credits scene shows present Sam who comes out of the time portal, puts Ledov's guitar on the stove next to the graves of all four partisans and, after standing in silence for a while, leaves into the portal again.
Serious Sam: Siberian Mayhem was developed by Timelock Studio, a Russian group composed of long-time members of the Serious Sam modding community, under the oversight of Croteam, the series' creators.[2][3] The Timelock Studio members had previously not been affiliated with each other but by chance worked together as testers for Serious Sam 4. The team felt that the game's levels set in Russia had unexplored potential and wished to develop them further. With initiative from their team lead Evgeny, they compiled an 80-page design document that they submitted to Croteam in September 2020, just before Serious Sam 4's release. The company greenlit the project as a three-level piece of downloadable content (DLC) for Serious Sam 4, though it later expanded to a standalone expansion as it outgrew the usual scope for DLC.[4] After settling on the name Serious Sam: Siberian Mayhem for the game, the group of modders founded Timelock Studio in 2021.[4][5] The development pipeline for a retail product marked a shift for the developers: According to director Igor Grinkevich, the workflow for an individual piece of content is creating and then simply releasing it, whereas the development for Siberian Mayhem introduced them to deadlines, marketing, and localisation. Each team member coincidentally had their own speciality, which Grinkevich described as a "wonder". In the design process, the developers sought to combine classic Serious Sam elements with modern ones to make up for faults they found in Serious Sam 4. Secrets and Easter eggs were added spontaneously. Croteam consulted Timelock Studio on creative and technical aspects, including optimisation, while Devolver Digital acted as the game's publisher.[4]
The game was first teased via a 34-second video published to YouTube in December 2021, showing protagonist Sam Stone navigating a frozen landscape.[6] Devolver Digital referenced the video again in early January 2022, stating that it would announce a new Serious Sam entry later that week and release it later that month.[7] The company announced Siberian Mayhem on 10 January 2022 and released it on 25 January for Microsoft Windows via Steam and GOG.com.[1][8] Owners of Serious Sam 4 received a 25% discount on the new game.[8]
Aggregator | Score |
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Metacritic | 70/100[9] |
Publication | Score |
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GameStar | 70/100[10] |
Hardcore Gamer | 4/5[11] |
Shacknews | 6/10[12] |
The Games Machine (Italy) | 7.8/10[13] |
NME | ![]() ![]() ![]() ![]() ![]() |
Serious Sam: Siberian Mayhem received "mixed or average" reviews, according to the review aggregator website Metacritic, which calculated a weighted average rating of 70/100 based on twenty-five critic reviews.[9]
Serious Sam | |
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Main series | |
Spin-offs | |
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