local player = game.Players.LocalPlayer

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

local button = Instance.new("TextButton")
button.Size = UDim2.new(0,150,0,50)
button.Position = UDim2.new(0.5,-75,0.8,0)
button.Text = "WalkSpeed: 16"
button.Parent = screenGui

local speed = 16

button.MouseButton1Click:Connect(function()
    if speed == 16 then
        speed = 32
    else
        speed = 16
    end

    local char = player.Character or player.CharacterAdded:Wait()
    local humanoid = char:FindFirstChild("Humanoid")
    if humanoid then
        humanoid.WalkSpeed = speed
        button.Text = "WalkSpeed: "..speed
    end
end)