Google it, I found the answer within 5 seconds of using Google. The only way someone is going to answer this odd question is by looking it up, you may as well do it yourself (I'm not wrong).

For simple questions like this which can be answered in 5 seconds (or less), try a search engine first. It's always a lot easier to look something up than wait several minutes, hours, days, etc for someone to reply (if at all).

You’re welcome.

Wouldn't that be Half-Life?
And the first non-Valve game on steam would be Rag-Doll Kung-Fu.
I didn't even have to google that.

引用自 DarkCrystalMethod：

Wouldn't that be Half-Life?
And the first non-Valve game on steam would be Rag-Doll Kung-Fu.
I didn't even have to google that.

I know Half-Life got a fairly substantial update a few years ago, but did Rag-Doll Kung-Fu ever receive an update? I know nothing about that game other than that it's on Steam and old.

How about using the AI mode of google and using the exact phrase you used here...

the AI spat out "Unreal World"...

引用自 Thiesen：

How about using the AI mode of google and using the exact phrase you used here...

the AI spat out "Unreal World"...

Initially released in 2016? There are plenty of games released before then that are updating.

Warframe was released in 2013. Guild Wars 2 in 2012 (although not on Steam). Both of them still get frequent updates.

引用自 Ben Lubar：

引用自 Thiesen：

How about using the AI mode of google and using the exact phrase you used here...

the AI spat out "Unreal World"...

Initially released in 2016?

1992
https://en.wikipedia.org/wiki/UnReal_World#1992:_Initial_release

here's a guy talking about the 1992 version if you're curious
https://crpgaddict.blogspot.com/2018/06/game-291-unreal-world-v-100b-1992.html