Portal 3 is nearly as mysterious and sought-after as the practically mythical Half-Life 3, as Valve, even after all these years, continues to withhold any and all official word on its iconic puzzle and FPS series. But the dream is, if you’ll pardon the pun, still alive, as Portal and Portal 2 GLaDOS actor Ellen McLain says she “wants to do a Portal 3”, encouraging fans to email Valve.