Mods / Cooperative

• CCity of the Pyramidsby NeiserStory 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...7.5k downloadsupdated 4 y ago
• NNSKuber's Resource Managerby NSKuberYou 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...3.5k downloadsupdated 4 y ago
• HHorizon -- Campaign (2023)by Spy's Cr3edHere 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...2.5k downloadsupdated 4 y ago
• TThe Warchaserby ThanadraxThe "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 downloadsupdated 4 y ago
• ((Update) Coldfrontby 76561199040911078History 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 downloadsupdated 5 y ago
• TThe Serpent's Sanctuaryby NekorieStory 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...2.1k downloadsupdated 20 mo ago
• [[SINGLE/COOP] UrbanDeHuman's "Please Fly 2022" Tribute (NEW GAME+ UPDATE)by UrbanDeHumanSome 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 downloadsupdated 2 y ago
• MMy Memories: Egyptby 76561199040911078My 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...1.9k downloadsupdated 3 y ago
• 116 Players Co-Opby NSKuberThis 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 downloadsupdated 5 y ago
• RRigatharby Sulphuric_GlueAfter 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 downloadsupdated 19 mo ago
• RReminiscenceby ThanadraxWhat 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 downloadsupdated 5 y ago
• BBackroomsby Cyborg.SeriousSiteBackrooms "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...1.5k downloadsupdated 4 y ago
• SSSHDWeapon&Item_CompletePack(Resource)by serious bombSSHDWeapon&Item_CompletePack(Resource) -This package contains SSHD weapons and items, including HD style weapons, HD style health, HD style armor, and HD style bullets. -The weapon has been adapted for Sam 4, and players can call HD weapons and corresponding upgrade accessories through NRM. The a...1.2k downloadsupdated 12 mo ago
• TTen Tidal Wavesby ThanadraxThe Great Tsunami Approaches! Welcome to the Ten Tidal Waves - a Survival stage-based map, where the biggest challenge awaits you. PLEASE, READ THIS IF YOU PLAY MULTIPLAYER: You have to set the following commands BEFORE (or during) playing this map to avoid huge ping delay for clients. For host:...1.1k downloadsupdated 3 y ago
• UUnderdarked - A Serious Journeyby FinzySerious Sam has stepped through a strange portal and finds himself in an even stranger underground realm that's literally out of this world. It's up to you to put together the pieces and figure out what's happened... Loosely inspired and based on the Underdark region from Dungeons & Dragons / For...1.0k downloadsupdated 3 y ago
• AA Serious Encounterby serious bombLevel After Sam used the time lock to open the multiverse, he found Sam from a certain point in time and gave him a special mission: to go to a certain time lock research station of Mental (Level 1), use it to travel back to the past, and find Mental's ancient elemental automaton to seize element...1.0k downloadsupdated 12 mo ago
• WWinter of Discontent MkII (Remastered)by Sulphuric_GlueA reworked version of my first SS map, now better balanced and with more stuff to do. Sam is plunged into a mysterious pocket dimension lorded over by a bloodthirsty entity. In order to escape, he must first face its challenges... The par time for the level is 35 minutes. This level is VERY DIFFI...957 downloadsupdated 4 y ago
• ((FIXED) X-Front 2022 - Eventby 76561199040911078About My first seasoned theme map for Serious Sam: Siberian Mayhem. Hope you enjoy, because it was really fun making this. Gameplay is default, but have some minor changes. Also there is a "quest system" and dialogue gui got an upgrade. Secrets are pretty simple, some of them may be fun and enjoy...838 downloadsupdated 4 y ago
• EEvents in the desertby 76561198882468386Prehistory: This path was not easy for me, I started developing this map exactly a year ago and continued only in May. To be honest, it was a very funny experience, my mood often changed depending on the theme of the map, I either hated or adored my work. But thanks to the support of some people...831 downloadsupdated 2 y ago
• SSerious SamCraft - Enact the Endingby Sulphuric_GlueThings are getting out of hand, Sam - Mental is invading other games now! Notes This map should be played with prebaked lighting off, or else most of the level will be too dark. I have made efforts to reduce frame drops under dynamic lights as much as I can by using alternate models that use less...727 downloadsupdated 9 mo ago
• FFall of Melancholy Village [Custom Story Campaign]by DizellfestCaught within the darkness an ill man must find a way to solve one mystery on why everyone has disappeared and on why dark creatures started to plague these lands. Explore the Villages, solve the mystery. The notes should help. |||PROJECT INFO||| FoMV is a short side project of mine which tells t...636 downloadsupdated 3 y ago
• SSecrets of Mystical Man :)by 76561199040911078Secrets of Mystical Man The events take place between the end of SS4 and the beginning of SS3. Sam, after killing the Creator, temporarily freed himself from the cycles of the Mystical Place. During this time, he managed to argue with Quinn that he could find something worthwhile in the first cav...582 downloadsupdated 17 mo ago
• FFoggy lawlessnessby 76561198882468386HI: hello everyone, despite the fact that this is my first map made, you can express criticism clearly and to the point so that in the future I can make maps better. Prehistory: when Sam arrived at the base, he wanted to take a nap. After he fell asleep, he dreamed of fog and a bunch of monsters....527 downloadsupdated 3 y ago
• PPrototype Finishers Remakeby 76561198956493704This mod aims to recreate Old and Prototype Finishers animations. Includes animations for Gnaar Female - Eye Torn Gnaar Male - Eye Torn -New Octanian Gamma Trooper - Break Neck and Jump Kick Octanian Commander - Break Neck and Jump Kick Octanian Sniper - Break Neck and Jump Kick Octanian Grenadie...525 downloadsupdated 4 y ago
• DDouble Jumpby 76561198879145591In short, this mod adds a double jump to the game Disclaimer! This mod is not mine, I just ported it here, the original author of this mod is NSKuber, thank him for this mod Link to the original - Update 2.0 from 03.01.2026 The original script has been modified so that double jumping can now be d...488 downloadsupdated 10 mo ago
• EExtended FOV for weapons + gadgetsby 76561198879145591The simplest mod that just makes a big fov for guns and gadgets470 downloadsupdated 3 y ago
• TTribe Of The Bells 2026 - Campaignby DizellfestLet the bells ring. DIFFICULTY: Easy Theme: Fantasy, Winter Wonderland Music: Metal, Techno Bot Support: Yes Weapons: Custom, All Unlocked Time To Beat: 25Minutes Enemy Count: Medium Level Count: 1 Universe: Unknown (Not Serious Sam Story) Worktime: 6 Days (FEATURES) - Automatically spawned AI Sa...410 downloadsupdated 11 mo ago
• NNeco-Arc Playermodels (SM)by ラミIf SM is a better version of SS4 (which is just not true), then adding NecoArc to it must make it the best game ever, right? Another port, another run into the ground funny cat joke. dori dori dori - Team colors; - First-person things called 'hands'; - Custom sounds. Issues: Same as before, non-s...365 downloadsupdated 4 y ago
• AAnime Game Character Packby serious bombCharacter List GENSHIN IMPACT ◆Chevreuse ◆Clorinde ◆Dehya ◆Escoffier ◆FischlPrincess ◆Furina ◆Ineffa ◆Jahoda ◆KukiShinobu ◆Mavuika ◆Navia ◆Nefer ◆QianZhi ◆Yoimiya HONKAI: STAR RAIL ◆Stelle ◆Cyrene ◆Firefly ZENLESS ZONE ZERO ◆Nnmber 11 ◆Anby ◆Ling ◆Vivian-Swimwear GIRLS' FRONTLINE 2: EXILIUM ◆Cent...348 downloadsupdated 10 mo ago
• HHalo 5-Master Chief Player Modelby 76561198799338803“Sierra 117 to Infinity. Argent Moon scuttled. I've reassigned Blue Team, destination Meridian. Potential contact from Cortana.” Fusion version SS4 version313 downloadsupdated 17 mo ago
• TTwin Maids Playermodels (SM)by ラミFor someone who is supposed to be gone, Rem is pretty damn tenacious, coming back again and again. Port of SS4 playermodels of Demon Twins of Roswaald Mansion, Rem and Ram, make their way into S&M - wait i didnt mean th- Includes: - Team colors; - First-person hands; - Custom sounds; - All season...303 downloadsupdated 4 y ago
• NNo Fall Damageby 76561198879145591Description of this mod: The mod allows you to plunge into the world of bunny hop and parkour without fear that you will be able to crash. So you can freely bunny hop in Siberade and parkour on the roofs of houses in Kalinovka.288 downloadsupdated 4 y ago
• TTrueno AE86 [Vehicle]by ArtEM-41+ Highly detailed model of the Trueno AE86 machine, downloaded from sketchfab + Detailed interior of the car with the ability to SIT in ANY place and put your friends there + + + + AS MANY as 14 tracks from Dave Rogers and the ability to include them at absolutely any level (even from a workshop...280 downloadsupdated 2 y ago
• GGachimuchi Playermodelsby ラミWhole gang is here. Well, minus Van. Port of SS4 playermodels into Siberian Mayhem. Billy, Danny and Ricardo, with all their features and drawbacks because weird texture job by model creators (Billy has his neck textures fixed though, so you can ignore the screenshots that show him from behind)....277 downloadsupdated 4 y ago
• SSurvival Scoringby RoosevPorted and updated from SS4 for SM! Enables scoring during Survival mode! (that includes CO-OP Survival.) -------------------------------------------------------------------------------------------------- - Points are now shown during Survival matches. - Enemies killed during Survival will now sp...270 downloadsupdated 4 y ago
• PProject Better Performance Siberian Mayhemby Mike UchihaSM+ Dont Support it ! Balance it Final Boss Not Done Double shotgun have 200 ammo max like Classic SS Patch For Serious Engine 4 Add this +cfg_bDisableStreaming=1 +sys_bAllowHyperThreading=1 +sys_bMultithreading=1 +sim_fWorldPrecachingStreamingLoadingDoneThreshold=-1 +texs_ctMaxUnloadsPerFrame=0...249 downloadsupdated 16 d ago
• WWario Playermodel (SM)by ラミNah, WAAH you, garlicman. Having failed in his search for treasure (and even more garlic), Wario now ventures into Siberia in hopes of finding his jackpot and finally retiring.. until he wastes it all on steaks. But nobody told him that garlic is off-season now. Includes: - Team colors; - First-p...246 downloadsupdated 4 y ago
• RRWBY Playermodels (MMD/SM)by ラミNo description? More like, no thinking involved in new season story lmao Anyways, SS4 port into SM, obviously. With all pros and cons as usual, nothing changed. Includes: - Team colors; - First-person hands; - Custom sounds. Issues: - Parts of models vertexes have been made into a singularity (Bl...232 downloadsupdated 4 y ago
• MMighty Samusby 76561198956493704Briefly Sam returned from the gym pumped up. Mod includes Sam, Future Sam with the beard and Mental Mate. SS4 - BFE Sunglasses SM -221 downloadsupdated 3 y ago
• GGirls' Frontline Sangvis Ferri Enemy Replacements (SM)by ラミAgent's filet part on my face NOW! Hot single SF waifus in your area! CLICK NOW -> Meanwhile me, sitting in the middle of nowhere in Siberia on an oil refinery outpost with seagulls and snitchy cunt as my only companions. Fear not, for that ad actually becomes true with this port of my SS4 mod, m...189 downloadsupdated 4 y ago
• SSeriousDivers : Orbital strikes Packby serious bombSeriousDivers : Orbital strikes Pack For SuperEarth!! For Democracy!! Orbital strikes list: --Orbital Laser --Orbita 120MM HE Barrage --Orbita 380MM HE Barrage --Orbita 500kg Bomb Barrage --Orbita Gatling Barrage How to use？ After subscribing to this mod, update the NRM database, and then call it...150 downloadsupdated 5 mo ago
• BBhop (Script)by Serious GooseBhop Mod This mod adds a bunny hopping mechanic to the game, similar to the one from Quake 3. Hold W + (A or D) and slowly turn your mouse in the same direction while airborne to gain speed. This mod was created specifically for speedrunner(s) and for the Quake 3 Movement mod. Released separately...142 downloadsupdated 11 mo ago
• SSpam Mod (SM port)by 76561198879145591Description of the mod: This is a port of my recent Serious Sam 4 mod for Siberian Mayhem with the addition of spam for TCC-2 "Perun" Crossbow Disclaimer: If you find any errors, write to me, I will try to fix them. Have a nice game!140 downloadsupdated 10 mo ago
• HHalo 5 Frederic-104 - Player Modelby SeriousNorboPort of Halo 5 Fred. Additionally has custom red and black skin! Commissioned by Fred-104 Porting & Rigging by SeriousNorbo Thumbnail & design of alt version by Fred-104 NETRICSA entry by Fred-104 (text mainly derived from the Halo 5 Limited Edition dossiers) - to view in-game, add "Content/Serio...140 downloadsupdated 9 mo ago
• IIncreased Player Jump Heightby 76561198799338803Increases the player's jump height. Makes obtaining of some of these difficult parkour secrets or evading fast-moving projectiles on the ground much easier! However, be careful of the higher risk of fall damage. Inspired by Artificial's Super Sam mod for SS3 and Fusion but with the increased move...139 downloadsupdated 3 y ago
• SSiberian Buddies (Bot Teammates added and AI Tweaked)by 76561199089588534NGs too hard? No one to play with? NPCs too weak? These are not problems. This mod adds five powerful bot teammates who can use various weapons and dual wield. (What if Kenny, Father, Jones didn’t die, and kill through Siberia with Sam and HellFire.) Serious difficulty and NG+4 are recommended. I...129 downloadsupdated 3 y ago
• SSRV Scarab [Vehicle]by ArtEM-41o7, CMDR! Now you can exterminate the Mental horde using the planetary scout transport Scarab from the Elite Dangerous game. !!! Attention! !!! - A scarab, spawned through a button - breaks the save. It is recommended to play in multiplayer. - Shooting with a view from the cockpit does not cause...128 downloadsupdated 2 y ago
• DDonkey Kong Female Gnaar Replacement (SM)by ラミLocal amerikanec abuses monke fella in 'definitely-not-Pripyat' with his gang of hippie-looking individuals. Stay tuned for more at eleven. More porting from 4th, more bajyeners, still no coconut gun replacement for the cannon. Credits: Nintendo, owners of Donkey Kong franchise and every related...126 downloadsupdated 4 y ago

55 cooperative mods, most downloaded first. Each one has its own page here with what it needs to run and where its author publishes it; the files themselves stay with the author and are never re-hosted on this site.