Found it as D-292 in my display layout book as a special edition of CTT. It was recently pictured in CTT. I'll post a pic of the D-292 if I can find one, so far no luck.
The D-292 has an outside route that climbs up both sides of the layout to make a small circle at the top, which then goes back down the other side. I thought the two sides climbing made for a tough gradient.
The D-292 is Super-O.