Just remembered this one thing that happened in 2023

[Sarah]

Slendytubbies 3 Multiplayer's server is turned off due to the game being merged with slendytubbies 2 and slendytubbies 1 into Guardian Collection.
also because of hacker attacks.
As for Slendytubbies Worlds, the servers are open (i checked on mobile i don't know about PC) but the game is getting ported over to Roblox.

That makes more sense. I was wanting to play the multiplayer that comes with Campaign for st3 for nostalgia but this makes sense as to why im unable to use the online feature for it, and im excited to see the game being ported to roblox!!! ive seen one named "Slendytubbies VS Redux" tried to get my partner into it and he said "Oh, its not console supported" which bummed me out. Hopefully the port is gonna be console supported when it comes out on roblox!!

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i dont think Multiplayer works for either st3 or worlds

Tried the multiplayer for st3. it unfortunately doesnt work.

it should be console supported, don't worry <3