SPEED CHANGER [UNIVERSAL]

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

local gui = Instance.new("ScreenGui")
gui.Name = "DeveloperSpeedGUI"
gui.ResetOnSpawn = false
gui.Parent = player:WaitForChild("PlayerGui")

-- Open Button
local open = Instance.new("TextButton")
open.Size = UDim2.new(0,100,0,40)
open.Position = UDim2.new(0,20,0.5,0)
open.Text = "Open"
open.BackgroundColor3 = Color3.fromRGB(35,35,35)
open.TextColor3 = Color3.new(1,1,1)
open.Parent = gui

local openCorner = Instance.new("UICorner")
openCorner.CornerRadius = UDim.new(0,10)
openCorner.Parent = open


-- Main Window
local window = Instance.new("Frame")
window.Size = UDim2.new(0,320,0,200)
window.Position = UDim2.new(0.5,-160,0.5,-100)
window.BackgroundColor3 = Color3.fromRGB(25,25,25)
window.Visible = false
window.Active = true
window.Draggable = true
window.Parent = gui

local corner = Instance.new("UICorner")
corner.CornerRadius = UDim.new(0,12)
corner.Parent = window


-- Title
local title = Instance.new("TextLabel")
title.Size = UDim2.new(1,0,0,45)
title.BackgroundTransparency = 1
title.Text = "Developer Speed Menu"
title.TextColor3 = Color3.new(1,1,1)
title.TextSize = 20
title.Font = Enum.Font.GothamBold
title.Parent = window


-- Speed Button
local speed = 16

local speedButton = Instance.new("TextButton")
speedButton.Size = UDim2.new(0.8,0,0,45)
speedButton.Position = UDim2.new(0.1,0,0.35,0)
speedButton.Text = "Speed: "..speed
speedButton.BackgroundColor3 = Color3.fromRGB(45,45,45)
speedButton.TextColor3 = Color3.new(1,1,1)
speedButton.Font = Enum.Font.Gotham
speedButton.Parent = window

local speedCorner = Instance.new("UICorner")
speedCorner.CornerRadius = UDim.new(0,8)
speedCorner.Parent = speedButton


-- Close Button
local close = Instance.new("TextButton")
close.Size = UDim2.new(0,40,0,30)
close.Position = UDim2.new(1,-45,0,5)
close.Text = "X"
close.BackgroundColor3 = Color3.fromRGB(160,40,40)
close.TextColor3 = Color3.new(1,1,1)
close.Parent = window

local closeCorner = Instance.new("UICorner")
closeCorner.CornerRadius = UDim.new(0,8)
closeCorner.Parent = close


-- Apply speed
local function setSpeed()
	local character = player.Character
    	if character and character:FindFirstChild("Humanoid") then
        		character.Humanoid.WalkSpeed = speed
                	end
                    end


                    -- Speed changer
                    speedButton.MouseButton1Click:Connect(function()
                    	speed += 4

                        	if speed > 100 then
                            		speed = 16
                                    	end

                                        	speedButton.Text = "Speed: "..speed
                                            	setSpeed()
                                                end)


                                                -- Open / Close
                                                open.MouseButton1Click:Connect(function()
                                                	window.Visible = true
                                                    	open.Visible = false
                                                        end)

                                                        close.MouseButton1Click:Connect(function()
                                                        	window.Visible = false
                                                            	open.Visible = true
                                                                end)


                                                                -- Keep speed after respawn
                                                                player.CharacterAdded:Connect(function()
                                                                	task.wait(1)
                                                                    	setSpeed()
                                                                        end)