Im making a hunger games map and I want the billboard health GUI to be hidden.
The currently available options for hiding the health bar above a player are:
Set the Player's Head Transparency to 1 (You'll need to make a duplicate head if you still want players to have a head!)
Make a custom character (i.e. not the default ROBLOX player) (This is quite complicated, I'd advise using (1) instead, works for most people)
Roblox created a method for this purpose:
game.StarterGui:SetCoreGuiEnabled("Health", false)
Run that in a localscript to disable the Health GUI for the player that the localscript is ran in. If you want to enable it again then just run this:
game.StarterGui:SetCoreGuiEnabled("Health", true)
I hope this helps.