Yeah, the easiest one on number of portals, you try doing it on steps.
EDIT: I DID IT I DID IT LOL, I had to restart and make the first port jump in two steps instead of three thus I could land on the upper platform and be on the third step then I just walked in, and not to far either, you can walk in and wait half a second and door will close early shaving off a step or two.
