Any help with F4? For context, I haven't solved solved the hint level, but I think have a very good idea of what to do if I do find the solution.
For ζ4 (ROT13):Fgneg ol ercynpvat bar bs gur abqrf va gur pyvdhr jvgu n arjyl-perngrq bar. Gura rkgraq gung gb gur fbyhgvba.