SpeedGui by Gemini

local ScreenGui = Instance.new("ScreenGui")
local MainFrame = Instance.new("Frame")
local Title = Instance.new("TextLabel")
local SpeedInput = Instance.new("TextBox")
local ApplyBtn = Instance.new("TextButton")

ScreenGui.Parent = game.Players.LocalPlayer:WaitForChild("PlayerGui")
ScreenGui.ResetOnSpawn = false

MainFrame.Name = "SpeedGui"
MainFrame.Parent = ScreenGui
MainFrame.BackgroundColor3 = Color3.fromRGB(30, 30, 30)
MainFrame.Position = UDim2.new(0.5, -100, 0.5, -50)
MainFrame.Size = UDim2.new(0, 200, 0, 110)
MainFrame.Active = true
MainFrame.Draggable = true 

Title.Parent = MainFrame
Title.BackgroundTransparency = 1
Title.Size = UDim2.new(1, 0, 0, 30)
Title.Text = "Ajustar Velocidade"
Title.TextColor3 = Color3.fromRGB(255, 255, 255)
Title.TextSize = 16
Title.Font = Enum.Font.SourceSansBold

SpeedInput.Parent = MainFrame
SpeedInput.BackgroundColor3 = Color3.fromRGB(45, 45, 45)
SpeedInput.Position = UDim2.new(0.1, 0, 0.35, 0)
SpeedInput.Size = UDim2.new(0.8, 0, 0, 30)
SpeedInput.Text = "50" -- Valor padrão inicial
SpeedInput.TextColor3 = Color3.fromRGB(255, 255, 255)
SpeedInput.TextSize = 16
SpeedInput.Font = Enum.Font.SourceSans

ApplyBtn.Parent = MainFrame
ApplyBtn.BackgroundColor3 = Color3.fromRGB(0, 150, 255)
ApplyBtn.Position = UDim2.new(0.1, 0, 0.7, 0)
ApplyBtn.Size = UDim2.new(0.8, 0, 0, 25)
ApplyBtn.Text = "Aplicar Speed"
ApplyBtn.TextColor3 = Color3.fromRGB(255, 255, 255)
ApplyBtn.TextSize = 14
ApplyBtn.Font = Enum.Font.SourceSansBold

local targetSpeed = 16
task.spawn(function()
    while task.wait(0.1) do
        pcall(function()
            local character = game.Players.LocalPlayer.Character
            if character and character:FindFirstChild("Humanoid") then
                character.Humanoid.WalkSpeed = targetSpeed
            end
        end)
    end
end)

ApplyBtn.MouseButton1Click:Connect(function()
    local value = tonumber(SpeedInput.Text)
    if value then
        targetSpeed = value
    else
        SpeedInput.Text = "Número inválido!"
    end
end)