(See the best response by Kaiochao.)
I basically created another game from scratch but technically it's the same game with the same mechanics with the same sprites, just different code. However, I did something that made it show on it's own hub.

Is there anything I can edit to make it show up on another game's server list?
Best response
Servers appear on the hub according to the world.hub var. If the hub has a password, you need that in world.hub_password for anything hub-related to work.
Thank you.