Slide Layers & Visibility

Hi there,

I have a question regarding making a layer visible at the learner's last pass through a slide. 

Here's what I am trying to accomplish:

Overview: 

1 slide, 3 learning choices available on the slide, let's call them A, B & C.

Scenario: 

Pass 1:

• All buttons in normal state
• Learner chooses a topic (A) -> goes through slides/interactions associated with that topic > then is looped back to the main slide

Pass 2:

• Button A in visited state; buttons B & C in normal state
• Learner chooses a second topic (B) & goes through slides/interactions associated with that topic > then is looped back to the main slide

Pass 3: 

• Buttons A & B in visited state; button C in normal state
• Learner chooses a third topic (C) --> goes through slides/interactions associated with that topic > then is looped back to the main slide

Pass 4:

• All buttons are in visited state

I would like the learner to be able to view a specific layer on the main slide at this time. 

Questions:
How do I make the layer visible on the learner's fourth pass through the slide?

Is this at all possible? 

Any feedback in regards to this would be very appreciated. 

Thank you,

Agnieszka