Check the Navigation in the sample at this post:
https://community.articulate.com/discussions/articulate-storyline/free-sample-restricted-and-free-random-navigation-using-variables-and-triggers
It has four buttons that take the learner to different topics. In this sample each topic is represented by a single page. When they are all visited, a button appears that can be used to take the learner to the next lesson. In the restricted navigation, the four buttons appear in order, only after the previous one is visited, in mixed navigation, the topics can be visited in any order, and in free navigation, the learner can advance to the next lesson before visiting all the topics.
