- Shooter
- Adventure
Game
Serious Sam: Siberian Mayhem
Serious Sam: Siberian Mayhem is a new stand-alone expansion to the world of the classic FPS series. Join the fight against Notorious Mental on a journey through the wild lands of Russia, and find your way through this lost chapter of Sam Stone's adventures.
Serious Sam: Siberian Mayhem is a new stand-alone expansion to the world of the classic FPS series. Join the fight against Notorious Mental on a journey through the wild lands of Russia, and find your way through this lost chapter of Sam Stone's adventures.
About Serious Sam: Siberian Mayhem
- Released
- January 2022
- Developers
- Croteam, Timelock Studio
- Publisher
- Devolver Digital
- Engine
- Serious Engine
- Series
- Serious Sam
- Platforms
- Xbox Series X|S · PC (Microsoft Windows) · PlayStation 5
Where to get it
Release, studio and platform data from IGDB. Store links go to the sellers, not to us. We do not sell games and we do not host files.
Browse everything
Sorted, filterable and paged. Every link goes to the author’s own download.
From the developers
Official announcements, newest first. Posted on Steam.
- Community AnnouncementsSerious Sam is Back, Baby! Enter the ShatterverseHey folks, It's a massive day for everyone at Croteam and Devolver Digital because we get to announce a brand new partnership with Behaviour Interactive, who are working on the next installment of the Serious Sam series. Serious Sam: Shatterverse is their take on the franchise, and a reimagining of the backpedalling mayhem you all love as a roguelite cooperative shooter. With Croteam hard at wo...
- Community AnnouncementsA Seriously Serious ChristmasFrom all of us at Croteam, we’d like to wish you a seriously Merry Christmas.May you enjoy the holidays with friends and loved ones, stay full of health, and welcome 2026 with joy, optimism, and a positive spirit for the year ahead.Thank you for being part of our community, and once again, Merry Christmas!
- Community AnnouncementsFeatured Mod - City Of The Pyramids{STEAM_CLAN_IMAGE}/41771282/a8d18713b7b2eb4156561fe16faa8787bf69c4e7.jpg Hello and welcome to the new episode of Featured Mod! For the first time in our series, we will be featuring a campaign for Siberian Mayhem! Today’s mod is “City Of The Pyramids”- a one-level campaign made by Neiser! The story is very simple- you’re taken to Ancient Egypt once again where Mental’s forces are running wild a...
- Community AnnouncementsAnniversary Update 1.07Hello, folks! Today is a very special day for all of us here at Timelock Studio, because exactly one year ago, Serious Sam: Siberian Mayhem hit the stores worldwide. You can say our brainchild has its first birthday, and what a journey that was... While the road was long and full of hard work, we are extremely pleased by the results and your warm welcome. Our team constantly updated and support...
- Community AnnouncementsHotfix 1.06cFixed an issue that caused increased player speed on NG++ and further to reset to normal speed after watching a cutscene; Fixed an issue that caused allied Draconian Burner’s AI to randomly break; Fixed an issue where some of the enemies’ original attachments would not show up if a seasonal savegame is loaded without seasonal content available (disabled/out of season); Fixed enemy navigation is...
- Community AnnouncementsHotfix 1.06bFixed Serious Editor incorrectly displaying text information/icons. Added fireworks to make discovering Christmas areas on levels easier. Fixed a few instances of drones getting stuck out of player’s view and blocking level progression. Improved displayed message in situations when the player has the “Way to Go” button, used to open NG+ upgrade menu, unbound. Adjusted Lasergun “overheating” sou...
- Mods indexed
- 270
- Versions
- 0
- Newest tracked
- none yet
- Most disruptive update
- No breakage data for this game
Most downloaded
Measured from the source's own counts, summed across every release.
- City of the PyramidsStory You are in Ancient Egypt and so are Mental's forces. Kill them all and save the planet. Seriously, it's that simple. Stats Estimated 100% Time: 45:00 mins Enemies: 1000+ Background What started as an attempt to make a map in 2 hours turned into 2 months of work. I wanted to make a map based...7.3k downloads
- Floating Outlined Pickups [Resource]Howdy! Here's a resource pack for map makers to use floating items in Siberian Mayhem! It's exactly what the name says. Comment if you have a request. Path: Content/SeriousSamSM/Databases/Items/FloatingOutlined/7.2k downloads
- Brotherhood Arms (Weapons Pack)Here we are - in Siberia. I assume you'll need a few extra firearms so here they come! All the publicly released weapons i've did in Sam 4 workshop now makes a comeback into Siberian Mayhem! Let's revisit what's inside MAC-10 Suppressed Flamethrower (+ Flamethrower Silver) Serious Bomb (+ Serious...5.0k downloads
- Russian voices by R.G. MVO & Metal TalesAdds full Russian dubbing to the game.4.2k downloads
- Dual Uzi [Resource]So basically the retro way of dual wielding, no more left click, right click. Get one Uzi and the other one is for free! [.:Highlights:.] * Intro animation * Functionally identical to SS2's Uzis (Besides rebalancing) * Netricsa message + Sub Skin (Silver) + NRM Support [.:Creds:.] Ar2R-devil-PiNK...3.6k downloads
- NSKuber's Resource ManagerYou may notice that your list of weapons is empty upon first use of the mod. This is because you have to use the Update database button on the bottom row first to obtain the list of supported entries! You may also notice that Stats Modifications are "Disabled" by default. To enable them, press th...3.3k downloads
- TLH Enemies (sorta)Bunch of TLH Enemies now available to Siberian Mayhem! The available enemies right now are - Lightning Man, Siren and Skeleton Warriors (Which are ported from 4). For more information how to set them up check the Sam4 Versions Siren Lightning Man Root: Content/SeriousSam4 In case I make any other...3.3k downloads
- [Resource] Aludran Reptiloids Pack (+3 Reptiloids) {SM version}Additional Aludran Reptiloids for SS SM Same resource, but for SM Enemy resource Includes custom Projectiles, Messages Includes: -Highlander -Highlander's Bride -Higlhlander Goliath Free for use on any your maps :3 Secret Giant Kazahstan Lizard project2.6k downloads
- [Weapon Resource] P-LAH ChainsawP-LAH Weapons Resources for Serious Sam Siberian Mayhem Ported from SS4 resource Can't be used as Akimbo Usage in vehicle is broken (sad) Can't be launched by FRPCL Thanks a lot to Spy's Creed for help with fixing some issues. Huge thanks to movento for help with making ARM textures for Chainsaw...2.5k downloads
- Horizon -- Campaign (2023)Here we are again with another campaign, this time done in a way more reasonable time. The campaign's main highlights would be the classic gameplay, linear design and overall just something to enjoy for a while. The main concept was to make a level based mainly on existing assets and to focus jus...2.4k downloads
- The WarchaserThe "Underworld demons" are loose Welcome to The Warchaser - an SP/COOP adventure set around forests and ruins, where the great "Hades" awaits. This pack of 2 missions is an excuse for release of a very short map, Reminiscence. This time, you will have more time to explore the world, and more foe...2.4k downloads
- Shared Level Design Presets(Not replacement!) It's basically bunch of presets, assets and examples for mapping that will potentially be reused for future content. I've decided to just branch out these assets so there will be no file duplicates and anything that can potentially be reused will be added here v04b [.:Shared Le...2.3k downloads
- Hills - Custom Campaign LevelA sort of reimagining of the fan favorite Serious Sam level, Dunes. The map should take around 10-15 minutes to beat if you're not going for secrets. The map has not been tested on co-op, but it should work. If you find any bugs, let me know! I'll do my best to fix them. I hope you'll have fun wi...2.2k downloads
- (Update) ColdfrontHistory You've appeared in this unknown, maybe Mystical Place with no reason. I've detected some activity from 2000 metres from us. Let's check it out! Features ● Classic Serious Sam gameplay ● 4 Skills ● 20 - 30 min map ● Nothing special, just chill map ● Fun secrets Updates Visual Update ● Adde...2.2k downloads
- Colt Anaconda Revolver - Now In Siberian Mayhem! (NRM Weapon Resource)This mod DOES NOT replace the original Pistol! You have to use NSKuber's Resource Manager in order to spawn and/or replace any weapon with Colt Anaconda. Colt Anaconda returns to Siberian Mayhem due to people's request! This gun includes custom animations, stats and sounds. Also includes the intr...2.0k downloads
- [SINGLE/COOP] UrbanDeHuman's "Please Fly 2022" Tribute (NEW GAME+ UPDATE)Some particular circumstances have led you to the flying islands on some planet, unknown to us. Somehow the only thing you know here is to get to the portal that you can activate to leave this place and continue with your life. But maybe the journey is worth being continued? It's up to you to dec...2.0k downloads
- Lava Elementals (Enemy Resource)Small and large Lava Elementals ported from SS4 into Siberian Mayhem. This is for use by modders who want to add Lava Elementals to their levels. The relevant files can be found under Content/SeriousSam4/Databases and then in the Puppets and Behaviors folders. Weirdly, the SM files contain bits a...2.0k downloads
- The Serpent's SanctuaryStory You are tasked with retrieving the ancient Sirian artefact called Jade Serpent which is used as a cloaking device. It is located in the Serpent's Sanctuary near the Temple of Ja' in the Lub'uja' Gorge. It was believed to be nothing but a myth before it was found by the Triple-A team. Mental...2.0k downloads
- My Memories: EgyptMy Memories It is a project that aims to improve my old maps and build them on newer engines of Serious Sam series. Here you can once again plunge into the atmosphere of Serious Sam 3, to remember my first map ever which is almost 3 years old and just enjoy the old map, while getting a completely...1.8k downloads
- 16 Players Co-OpThis mod raises the max player count in Cooperative and Co-Op Survival gamemodes to our beloved 16. The mod also spawns additional vehicles/mechs in all campaign levels which have them. Note: every player looking to join such a high-player count game must have this mod installed.1.8k downloads
- RigatharAfter taking off from Earth at the end of The Second Encounter, Sam travels through the empty void of space to seek out Mental and fight him on his own doorstep. However, his ship is unexpectedly caught in a gravity well, and crash-lands on an Earth-like alien planet; Rigathar. Sam's primary conc...1.6k downloads
- ReminiscenceWhat lies in memories isn't always true... Welcome to Reminiscence - an SP/COOP short map set around abandoned church, inhabited by Mental's horde. This mission is my first and, probably, last map for Siberian Mayhem for a long time (depending on how things go). With limited supplies, you will ha...1.5k downloads
- Sturmgewehr 44 (NRM Weapon Resource)This mod DOES NOT replace the original Assault Rifle/AK-74MX! You have to use NSKuber's Resource Manager in order to spawn and/or replace any weapon with Sturmgewehr 44. Aliens invade your home planet and you suddently feel pretty nostalgic for some reason? The grandpa of all assault rifles comes...1.5k downloads
- BackroomsBackrooms "If you're not careful and you noclip out of reality in the wrong areas, you'll end up in the Backrooms, where it's nothing but the stink of old moist carpet, the madness of mono-yellow, the endless background noise of fluorescent lights at maximum hum-buzz, and approximately six hundre...1.4k downloads
Browse all 270 Serious Sam: Siberian Mayhem mods Sortable by downloads, rating and date.
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Why Serious Sam: Siberian Mayhem mods break
A mod is compiled against one version of a game. When the game updates, anything that reached into the parts that moved stops working, and it usually stops working silently rather than with a message that explains itself.
That is what the table above counts. It is not a guess: each row is a mod the community has reported as broken by that specific release. The number is a fair measure of how disruptive an update was, and it is the reason people delay updating a game they have modded heavily.
Common questions
Does IndexGG host Serious Sam: Siberian Mayhem mods?
No, and it never will. Every download link points at the author's own page on Nexus, GitHub, CurseForge or wherever they published it. We index the ecosystem; the files stay with the people who made them.
Where does the compatibility data come from?
From the communities that maintain it in the open, not from guesswork. Each claim carries how it is known, so a reported breakage is never presented as though the author said it.
Why is a mod listed as broken when it works for me?
Compatibility depends on your exact game version and the rest of your load order. A mod marked as broken in one release may work fine on an older one, which is exactly why the version is recorded next to the claim rather than a bare yes or no.