How do you add another name to a leaderboard with only there having to be 1 player?

So i want to make a scary game and i want to add this to my game to make it a bit more creepy, Basically what i want to make is when a player enters a game (my game is gonna be single player) in the leaderboard his name with load but what i also want it to do is for the leader board to add another name. just like it does in clonetrooper's melvin place. if you dont know what i mean watch this

https://www.youtube.com/watch?v=jT7Uv5V8lwA

Keep looking at the leader board

Ive tried everything to make a script like this still not able to get it though

One method is to disable the default leaderboard using game.StarterGui:SetCoreGuiEnabled(Enum.CoreGuiType.PlayerList, false) and replace it with a custom leaderboard - then you could easily add fake player names into the GUI whenever you want.