Brian said:
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.
*edited* I am the *edited*ing portal master. I will pwn your face. I’m over 80% complete on challenges and that’s because I took a break from Portal to get back in to CSS.