-- Only works in Studio (Plugin/Test Mode)
local screenGui = Instance.new("ScreenGui")
screenGui.Name = "BlackScreen"
screenGui.IgnoreGuiInset = true
screenGui.Parent = game:GetService("CoreGui")

local blackFrame = Instance.new("Frame")
blackFrame.BackgroundColor3 = Color3.new(0, 0, 0)
blackFrame.BorderSizePixel = 0
blackFrame.Size = UDim2.new(1, 0, 1, 0)
blackFrame.Position = UDim2.new(0, 0, 0, 0)
blackFrame.Parent = screenGui