Hum, IMHO it could be considered a 10th level, because when you solve the number of cells to access the next level you're already receive its status.
I mean, when you filled the 9th cell from level 1, you're promoted to the next level. In an analog way, after solving the unique challenge from level 9 you reached a new level... Geb! :-)
Anyway, adding the x.y info to ranking should give more visibility to our Gebs.... ;-)
Cheers.