Access to content for non registered users

Hi, I am creating a site where all the general news and updates can be read by anyone without needing to login.
But special content need a registration and then are separated by roles.

The problem is that right now, I have the normal WordPress roles + 2 other I created for the special content. These roles are tied to specific categories:
Categories availabele: Cat1, Cat2, Cat3, Cat4, Cat5
Role 1 -> Access to Cat1, Cat2
Role 2 -> Access to Cat1, Cat2, Cat3, Cat4, Cat5
Non registered -> *Should have access to all free content, but right now the free content would invove categories 1 through 4.

But when I tie the content to each registered role by category, the non registered users can’t see the free content. Also, if I have a Cat6 that I try to reserve only for the Free Content, and don’t associate Cat6 to any role, the nonregistered users can see Cat6 but not the role 1 and role 2. If I go the other way around, then role 1 and 2 can access the Cat6 but not the non registered users.

How can I better do this?

Thanks