restricting navigation to certain scenes
I'm sure there is any easy way to do this, but it is eluding me. I have three versions of the material in my project. I have set it up so that people using the Supervisor or Teacher versions must enter a code (numeric question slide) to enter their version. I can't figure out, however, how to keep Students from accessing the material on the supervisor and teacher versions by clicking on the slide after the access code from the menu bar. I know I can hide those slides on the students menu bar, but I wanted the supervisors and teachers to be able to go back and forth between versions. I can't figure out how to lock slides in just one segment. Sample of the project is attached. Thanks in advance for your help.
PS--if you want to access sections, Supervisor code is 12345, Teacher Code is 67890