Here's the script:
local UserInputService = game:GetService("UserInputService")) local currWalkSpeed = 10 UserInputService.InputBegan:connect(function(key) if key.KeyCode == Enum.KeyCode.LeftControl then if currWalkSpeed == 10 then currWalkSpeed = 20 else currWalkSpeed = 10 end game.Players.LocalPlayer.Character.Humanoid.WalkSpeed = currWalkSpeed end end)