Generate a Menger Sponge from the selected cube

MengerSpongeRbx.lua

function MakePartCube(cube)
	local cubes = {}
	local holes = {
		[5]=true,
		[11]=true,
		[13]=true,
		[14]=true,
		[15]=true,
		[17]=true,
		[23]=true
	}
	local size = cube.Size.X/3
	local position = cube.Position - ((cube.Size/2) + Vector3.new(size/2, size/2, size/2))
	local i = 1
	for x = 1, 3 do
		for y = 1, 3 do
			for z = 1, 3 do
				if not holes[i] then
					local part = Instance.new("Part")
					part.Anchored = true
					part.TopSurface = "Smooth"
					part.BottomSurface = "Smooth"
					part.Size = Vector3.new(size, size, size)
					part.BrickColor = cube.BrickColor
					part.Material = cube.Material
					part.CFrame = CFrame.new(x*size, y*size, z*size) + position
					part.Parent = cube.Parent
					cubes[i] = part
				end
				i = i + 1
			end
		end
	end
	cube:Destroy()
	return cubes
end

function MengerSponge(cubes, n, count)
	local count = count or 1
	for i,v in pairs(cubes) do
		if count <= n then
			MengerSponge(MakePartCube(v), n, count  + 1)
		end
	end
end

MengerSponge(game.Selection:Get(), 2)