How do i make a timestop effect?

There you go bud Feel free to ask me if you want some modifications for example freezing player's character only or such things. This will freeze the whole workspace and unfreeze it in 3 seconds Use GetDescendants since it gets the children of the children of the children and so on

FREEZEME=workspace -- Change it if you don't want the whole workspace frozen
function anchor(bool)
    children=FREEZEME:GetDescendants()
    for i=1,#children do
        if children[i]:IsA("BasePart") and children[i].className~="Terrain" then -- Checks if it is a basepart and not a terrain
            children[i].Anchored=bool
        end
    end
end
-- In order to toggle it type anchor(true) or anchor(false)
anchor(true)
wait(3) -- How many seconds do you want it to wait?
anchor(false)