RogueTech for battle tech is amazing. Hundreds of hours into it.
I was always astounded by hl2 mods.
There was one in particular that I really liked but it always crashed on me when I got even a little far in it. You spawn in a hotel and have to get away from the combine or something. I don't remember what it was called. But I really liked the idea of it.
Enderal
My partner doesn't like skyrim but loves Enderal
GregTech. You need to be special to make the game this complex, and I am more for playing it.
I really liked the Custom Maps in Warcraft 3 online play. I used to play Hero Line Wars, Mauls and TDs, Dota, Legion TD among other amazing community made maps
The "Vanilla: Expanded" series of mods for Rimworld adds an almost unbelievable number of new mechanics, almost all of which are intercompatible with most other popular mods. It's truly impressive how empty the default game feels after you play with mods for a while.
And if you limit it to just one single mod, I'd say "Save Our Ship 2" should get the Rimworld modding crown. IIRC Tynan himself reacted with amazement at how that had managed to add so many new mechanics to the game.
I forgot the names but there are a few amazing X-COM / UFO / Terror from the deep mods!
First thing that came to my mind: OreSpawn
Too bad that the creator went crazy
or he already was...
Yes, orespawn. that sure was something, probably was crazy all along. I am reminded of certain Skyrim modders when I think of orespawn
Action Half-Life was pretty great.
Lights. Camera. Action!
Hearthstone Access Community Version: https://hearthstoneaccess.com/
Patches full screen reader access into the game, despite no modding API or developer support, and makes it feel like it was natively there from the start. And is usually updated within 1-2 hours of Hearthstone getting a new version.
There are similar addons for Stardew, Slay The Spire, and Factorio. But I consider those less impressive as the game offers APIs for them to use.
Enderal was already mentioned so I'll say Project Brutality
It turns ol' Doom into a totally new (and so over the top that you can't help but love it) game
The New Order: The Last Days of Europe for Hearts of Iron 4
Considering how opaque the game was for modding, I'd argue Hearts of Iron 3 BlackIce is the more impressive achievement
Keep chunks loaded on Dinkum was pretty great since it allowed my auto mods to keep running while I was in the mines.
There was a mod for original half life called "Earth's special forces" and it had a variety of characters such as spider man, Goku, mega man, spawn, batman, superman, etc... it was super fun to Webb sling around the map or fly around or shoot kameha mehas.
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