Hello dawnmau,
I have added 2 macros and a user form to your workbook. The user form asks for a password to unhide the restricted sheets. The 2 macros hide the sheets and call the user form to show them. In VBA worksheets can be either hidden or very hidden. The difference is a worksheet that is very hidden can only be made visible again through macro code. When worksheets are very hidden, the user doesn't even know they exist, unless they open the VB editor. If you want to add another level of anti-tampering, you can password protect your VBA project. This will keep more experienced users form being able to see your VBA code. Here are the macros and the UserForm code.
Module1 Macros
UserForm1 Code
Change the password in bold to what you want.
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