Game Logic in Moodle Skill Tree research

Skill tree in games vs in moodle and learning / teaching.

when you go and sign up for collage class. you might have some sort of prerequisites / requirements before able to join a give course/class example needing to take history 101, English 102, math 103, before getting into history 203 in a sense the collage has a "course tree" were different things are required / suggested to have before you can get into a given course. some times have worked in X field / job for so long counts as a fulfillment of getting into a course.

so how should a skill tree in moodle work? should there be a strict tree base with leaf-lets. main branch -> then each sub branch -> and another sub branch -> eventally getting to a leaf much like a bullet list

1. main branch
   1. sub branch
      1. yet another sub branch
         1. yet another sub branch
            1. yet another sub branch
               1. yet another sub branch
                  1. evetntally getting to a leaf
   2. yet another sub branch
      1. yet another sub branch
         1. evetntally getting to a leaf

OR one to many and many to one... ((see below picture)) CLICK HERE to edit flow chart

in above flow chart. it would seem you would need to learn reading, print, cursive, typing, oral, of letters A and D, and build yourself up to the word ADD, before you begin to learn how to actual learn MATH -> ADD (skill)

i do not want to get into to complicated many to one, and one to many skill path flow chart just yet. take some time to think about it.