Firstly I apologise if this idea duplicates any already mentioned in the previous 44 pages as I haven't read them all yet.
For those of us who complete the levels weekly, it would be fantastic if we could get extra challenges (rewarded of not) to play against other players who have no new levels to complete.
One suggestion would be a portal at the end of the game where we could go in and compete in a separate weekly race in the format of the episode race using specific past levels perhaps?