Mods / Underground

• TTomas2886cz Adventuresby 76561198341096084Tomáši!!! it's time to rise and shine... You spent 10 years in your basement... You played games with your friends, half life alyx, but the strange thing is that even after half life alyx, half life 3 is nowhere. But you just don't realize that valve is always one step ahead. half life 1, 2 and A...438 downloadsupdated 4 y ago
• AAlarms and Jeffby 76561199173160747Missed throwing bottles to play fetch with Jeff? Alyx cross paths with him again and bottles are not always within reach... Two "endings" to choose from: let Jeff die or watch him trudge into the sunset. Update: I'm sorry but I won't be able to re-release this with a new art pass. Sadly, my PC cr...424 downloadsupdated 4 y ago
• MMane Six Gnome Replacementby 76561198373006683About this mod This mod replaces Gnome Chompski with My Little Pony: Friendship Is Magic Mane Six characters: Twilight Sparkle, AppleJack, Pinkie Pie, Rainbow Dash, Rarity and Fluttershy. Yes, there are 6 of them, and instead of being random, you can take any of them. Or even all six of them! I w...423 downloadsupdated 3 y ago
• PPurposeby dmtdeadmanThis is a short, roughly 10 minute long "walking simulator" type map. There is no combat, only strong ambience and atmosphere in a similar vein to something like "The Beginner's Guide". I wont to give too much more away. I hope you enjoy.406 downloadsupdated 3 y ago
• LLast Stopby 76561198383093329After an abrupt stop, the station is a little different to how you remember... Last Stop is a short horror map for the spooktober vaultmaps competition; it aims to scare and challenge whilst maintaining relative comfort. I am aware of some bugs; an update will be released shortly after judging (i...385 downloadsupdated 4 y ago
• EEBE063by CuserMap Story Soldier, rebels have ambushed a convoy transporting our latest electric experimetal biotic entity. We know it is still inside the tunnel, so your task is to capture it ALIVE, for this your teammates have deployed a trap inside the tunnel, you make sure it follows you into it. Features -...378 downloadsupdated 6 y ago
• GGnome Huntby 76561198836606621I will pay everyone 1€ if they find every single garden gnome in the map :) (There are 29 Gnomes hidden in the level and 170+ Gnomes in total)358 downloadsupdated 2 y ago
• SSigned : Chapter 1 ? "A bad dream"by 76561199151758923This little chapter was made possible with : -ApertureVR - Thinking Without Portals -TTS microsoft -Portal 2 Music used : "4000 degrees kelvin" from Aperture Science Psychoacoustic Laboratories Playtime ~10 minutes You'll need to subscribe to "ApertureVR - Thinking Without Portals" for this addon...344 downloadsupdated 8 mo ago
• SSigned : Chapter 3 "Extravaganza purpose"by 76561199151758923Story: You've been in that van for the whole night now; the people called "Combines" captured you and are now inspecting the whole facility. Sometimes you have flashbacks of the old days at home. You think this is the end, that you're gonna die, until something happens.. Credits : λrockh for the...328 downloadsupdated 6 mo ago
• MMission Impossible: Alyxby ArchitectA recreation of the infamous MI scene. Taken from my Matrix Mod's Easter Egg, and turned into a solo mod. Warning: The majority of this mod is meant to be played in "Crouch" mode. Or, for more immersion, i recommend laying down as if you were really crawling around the HVAC, similar to Bruce Will...320 downloadsupdated 2 y ago
• SSigned: Chapter 2 "Surface facility"by 76561199151758923This little chapter was made possible with : -ApertureVR - Thinking Without Portals -Elevenlabs Ai voice -Portal 2 Music used : "Fly Me to the Moon" by Frank Sinistra "Trash Compactor Waltz" by Mike Morasky READ : To start the chapter, load the map signed_chapter2 and enjoy! If you felt the main...315 downloadsupdated 8 mo ago
• Mmany room challenge killing and killingby Danyyou have been recruited to do a test your ears will play tricks on you hahahahaha the boss will watch you good luck276 downloadsupdated 3 y ago
• UUnknown_Locationby Bhun- - Warning: moving train rides. Video of my playthrough :268 downloadsupdated 13 mo ago
• BBlockout_1by ANDYNAMARCAMy first fully playable level with Hammer and for Blocktober! There is much work to do and space to fill up but I wanted to upload the level for feedback. There is various things I have to fix and refine but it's already fully playable. It's a level for people who already played HL Alyx, there is...237 downloadsupdated 4 y ago
• Sscp 087b: Surranby Bordie3DA short SCP 087 b experience. Original monsters can be found, modeled and animated by me. A special new monster I think people will be surprised by has been added too. This map is and will always be disgustingly unfinished. May it inspire someone who can make it better than I did. I'm happy with...228 downloadsupdated 4 y ago
• JJudge Dredd Sky Packby Leva the Drug LordCollection of 12 skyboxes from game Judge Dredd vs. Death. Addon contains the following skyboxes: Mega City One Basement Day Mega City One Docks Night Mega City One Hall Day Mega City One Basement Day Mega City One Hospital Day Mega City One Lab Night Mega City One Mall Night Mega City One Hospit...228 downloadsupdated 2 y ago
• Ccontainer room escapeby Danyyour partner went to get card for elevator and never came back Dead watch you easy map223 downloadsupdated 19 mo ago
• PProject Synapse Unit Overhaulby LunarRose17Literally all the textures from Project Synapse is stored here for the units. If anyone ends up running into issues with this addon, please let me know! My discord is LunarRose/maximum15208 downloadsupdated 15 mo ago
• CCave shortcutby 76561199151758923Russell found a shortcut ! But it's pretty deep... Small map I made in 1 week ! Playtime is arond 10 to 15 minutes, have fun !!206 downloadsupdated 7 mo ago
• Ttl_bluecourt2by 76561198798630965Remaster of gm_bluecourt in Source 2! Custom textures! Fun! Take a better look at the map with this video by Skummeh: Thank you Skummeh! I will get to updating this map and adding spawn ammo eventually!193 downloadsupdated 4 y ago
• Hhazard01.bspby 76561198373006683Everyone loves Half-Life 2 Beta. At least, you, fans usually say so. I ♥♥♥♥ ♥♥♥♥♥♥♥ noticed your passion about our series, so I fixed your build of Half-Life: Alyx so it'll fit you perfectly! I know, this can be a little bit scary, but it's what you deserve for something you've done back in 2003....170 downloadsupdated 4 y ago
• HHead to the Surfaceby 76561198367136564This is a second map that I made after the first one that was very short I learned a lot from the tools when making this one and I hope it is enjoyable Please try it and let me know what you think. Any feedback is great in case I want to fix anything or learn more in my possible future maps I jus...169 downloadsupdated 2 y ago
• XXortal (contest version)by 76561198427646008This was my contest entry, unfortunately was cut due to a major bug that has now been fixed thanks to Bear on the half life alyx modding hub. The map is exactly how it woild have appeared in the contest except for bug fixes.161 downloadsupdated 6 y ago
• CCombine Second Contact(Revamp)by Quantum_StormA brief engagement with a combine squad and some zombies. A big thanks to Ihonnyboy for taking his time and helping me revamp this also his guide helped a lot. ( is a great guide for setting up combat battles. )159 downloadsupdated 5 y ago
• CCubeby 76561199111603847Cube is a combat-free Portal inspired VR experience. The goal is to provide interesting environments that challenge the player. The mod consists of 13 levels that vary in difficulty from very easy to somewhat difficult. This map contains experimental mechanics, so I've included a Skip Level featu...145 downloadsupdated 10 mo ago
• LLiminal Tunnelby BurgerpocalypseA short practice level. No actual gameplay.132 downloadsupdated 4 y ago
• PPistol Reliantby 76561198335703777This is a beta for my map pistol reliant where your only tool is a trusty handgun.106 downloadsupdated 4 y ago
• FFirst Mapby StvnThis is my first map(meine erste map(eigentlich nicht aber ok)) After 2 years of development, hopefully it would have been worth the wait. I was forced to do this map please helpUF()4ehgu89renh8o0gh e5t80thu9ßhtrfjh itprjß+ haha hab mich in den pc mit ssh und udp gehackt, hallo (typ mit half life...75 downloadsupdated 10 mo ago
• CClean House: a cancelled campaignby 76561199060287984this was a campaign i was working on but decided to abando nto focus on one project i jsut decided to release what i had so far74 downloadsupdated 3 y ago
• MMelons.by 76561198407882011Please Download The bugfixed Version: PartOne of Four. Melons Melons And More Melons.61 downloadsupdated 4 y ago
• ((LEGACY) Roguelike prototypeby 76561198342454144A small prototype for a roguelike map i'm working on, most of this will be scrapped43 downloadsupdated 3 y ago
• [[S2FM] MANEATER (lethal company)by 76561198814859675my first S2FM mod problems like hair not transparent and no IK bone cause idk how to do those feel free to take the mod and make it better. also the size of the 2 maneater adult and baby are too big so change it in right click/utility/and there should be something with scale thing UPDATE : added...42 downloadsupdated 2 y ago

128 underground 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.