Is it possible to close the client without crashing it?

I wish to have a user click a button, and that would close the client window.

E.g.

local btn = script.Parent
btn.MouseButton1Down:connect(function()
	--Close client
end)

Is this possible?

Unfortunately, it's not possible. But you can instead use Kick on the player and disconnect their client from the game.

game.Players.LocalPlayer:Kick("The message that the player sees")

It's Not Possible But You Can Kick Note! Only Works In Normal Script! player:Kick("IDK Why But I Want To Kick You") As This Needs To Be In A Normal Script You Need To Define player Variable In The Way You Want Because LocalPlayer Does Not Work! Put Whatever You Want Inside The ("")