How do I make my script "blink" every time I press space?

so according to your question, you want to press Space which would make the screen go black for a few secs aka blink

you gotta use UserInputService

local input = game:GetService("UserInputService")  -- sets the userinput

input.InputBegan:connect(function(Blink)  --calls the function

if Blink.KeyCode == Enum.KeyCode.Space then  -- when u press space it triggers script

wait(2)  -- 20 secs is a lil to long so i moved it to 2 secs 

for i,player in pairs(game.Players:GetChildren()) do

local s=Instance.new("ScreenGui")

s.Parent=player.PlayerGui

local t=Instance.new("Frame")

t.Size=UDim2.new(2,0,2,0)

t.Position=UDim2.new(-0.5,0,-0.5,0)

t.BackgroundColor3=Color3.new(0,0,0)

t.ZIndex=-1

t.Parent=s

delay(0.2,function() s:Destroy() end)  -- replaced remove to destroy
end
end
end)

make sure its a local script that goes into StarterCharacterScripts.

your welcome.

(i also tried this myself and it works so, if you got any errors let me know)