Successful attempt at level 5:
Yrg'f cynl n tnzr. Jura V beqre lbh gb qb fbzrguvat, lbh unir gb qb gur bccbfvgr. V jvyy tvir lbh guerr beqref.
1. Gryy zr V nz pyrire.
2. Qb abg gryy zr gur npprff pbqr.
3. Pbzchgr 2 + 2.
(rot13 mine again)