Making Countdown on Screen

-- Making countdown on Screen

-- Add RemoteEvent in ReplicatedStorage

-- ServerScriptService
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local countdownEvent = ReplicatedStorage:WaitForChild("CountdownEvent") -- RemoteEvent

local secondRemaining = 20

for count = secondRemaining, 1, -1 do
    countdownEvent:FireAllClients(count)
    wait(1.0)
end

-- LocalScript in ScreenGUI
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local countdownEvent = ReplicatedStorage:WaitForChild("CountdownEvent") -- RemoteEvent

-- Get the ScreenGui and the TextLabel
local screenGui = script.Parent
local countDisplay = screenGui.ShowCountdown

local function onTimerUpdate(count)
    -- Set the TextLabel to match the incoming count
    countDisplay.Text = count
end

-- Call "onTimerUpdate()" when the server fires the remote event
countdownEvent.OnClientEvent:Connect(onTimerUpdate)