Simple Noclip Script

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

local function setNoclip(enabled)
    local character = player.Character or player.CharacterAdded:Wait()

    for _, part in ipairs(character:GetDescendants()) do
        if part:IsA("BasePart") then
            part.CanCollide = not enabled
        end
    end
end

-- Enable noclip
setNoclip(true)

-- Disable noclip later
-- setNoclip(false)