If a game’s short URL (slug) is changed, does the old URL redirect to it, or are all of the game’s old links broken?

Tested it. There is NO redirect.

Yeah, as other moderators who have games need to change their URLs stuff aswell lol.

But URLs are case insensative, and you get redirected to the correct one.

Also, update the old links on guides/resources/forum posts/Discord after you change the URL. And I'm sure less people than you expect are impacted by this change.