Thanks a lot, my friend, now I’m on level 11. I brute-forced level 10; I have no idea why it worked.
Level 10: Oynpx vf va purpx sebz gjb qvssrerag cvrprf. Sebz zbfg bgure cbfvgvbaf ba gur obneq vg pbhyq unir orra n erirnyrq purpx. Ohg sebz gur jvaavat cbfvgvba, oynpx jbhyq unir unq gb raq gurve cerivbhf ghea va purpx, juvpu vf vzcbffvoyr.
11: Bapr ntnva, vg'f vzcbffvoyr sbe fbzrbar gb raq n cerivbhf ghea va purpx.
