The clicker game — clicks become coins

Now you build your first actual game: a clicker. Click a big button, earn a coin, watch your total climb. It's tiny, but it's a real game — a player, an action, a reward, an update. Every future project is this loop wearing a costume.

#The system map

Three pieces, one loop:

CLIENT (LocalScript)          SERVER (Script)
   button on screen      →    OnServerEvent: verify, award +1 coin
   shows coin total  ←───     FireClient: "here's your new total"

The client reports clicks. The server decides and records. The server tells the client the new number to display. Clicks are never trusted, coins are never granted by the client.

#The server (a Script in ServerScriptService)

local ReplicatedStorage = game:GetService("ReplicatedStorage")
local clickEvent = ReplicatedStorage.ClickCoin

local COIN_PER_CLICK = 1

clickEvent.OnServerEvent:Connect(function(player)
    local coins = player.leaderstats.Coins
    if coins then
        coins.Value = coins.Value + COIN_PER_CLICK
    end
end)

Nothing new here — you've written all of this. It verifies the player has real stats, adds one coin, done. The COIN_PER_CLICK constant is your first balancing knob.

#The client (a LocalScript in StarterPlayerScripts)

This is the new part: the client both sends clicks and receives totals.

local Players = game:GetService("Players")
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local player = Players.LocalPlayer
local clickEvent = ReplicatedStorage.ClickCoin

local screenGui = Instance.new("ScreenGui")
screenGui.Parent = player.PlayerGui

local label = Instance.new("TextLabel")
label.Size = UDim2.new(1, 0, 0, 60)
label.Text = "Coins: 0"
label.TextSize = 28
label.BackgroundTransparency = 1
label.Parent = screenGui

local button = Instance.new("TextButton")
button.Size = UDim2.new(0, 200, 0, 120)
button.Position = UDim2.new(0.5, 0, 0.5, 0)
button.AnchorPoint = Vector2.new(0.5, 0.5)
button.Text = "Click for coins!"
button.TextSize = 22
button.Parent = screenGui

button.Activated:Connect(function()
    clickEvent:FireServer()
end)

clickEvent.OnClientEvent:Connect(function(total)
    label.Text = "Coins: " .. total
end)

The button reports clicks; OnClientEvent receives the server's totals and writes them to the label.

-- receive totals from the server

#Closing the loop: the server sends back

The server currently doesn't send totals back. Add the sending half:

clickEvent.OnServerEvent:Connect(function(player)
    local coins = player.leaderstats.Coins
    if coins then
        coins.Value = coins.Value + COIN_PER_CLICK
        clickEvent:FireClient(player, coins.Value)
    end
end)

Now the loop is complete: click → server awards → server sends the new total → client's label updates. One coin per click, verified end to end.

#Common mistakes

• Skipping the FireClient half. If the label never updates, check the server sends FireClient — and that both scripts use the same RemoteEvent name.
• Letting the client read and display leaderstats directly. Same bug as security, now at display level. Feed the label from the server.
• Firing per-frame. A loop that awards coins with no wait is a coins fountain.
• Mismatched RemoteEvent names. ClickCoin vs CoinClick — a silent, frustrating bug. Name once, use the exact same name both sides.

Next: coins without clicking — the idle bonus loop.