As for level 10:
Guvf bar vf irel qrprcgvir (naq cerggl zhpu vzcbffvoyr gb frr vs lbh unir fxvccrq 8).
The solution is abg gb pneel n oybpx bire gur "evire" ohg engure gb qhcyvpngr gur bar gung vf nyernql gurer.
