dark matter

If you solve a task, you get x2 dark matters, opening a new lesson is -1 dark matter. If you cannot open a next lesson and cannot solve tasks, it must mean that you have run out of dark matter(so you cannot move on), and you must buy a subscription to continue doing tasks, to then do dark matter. Some lessons do not have tasks, but I'm pretty sure the courses are calculated so that you must have enough dark matter to go through these. Perhaps if you go to the previous courses and complete all the tasks, you should have enough dark matter to move on. If not, you probably have gotten to a point in the course(which based on your level is pretty likely) when you just have to buy a subscription to complete the tasks and move on.

Hello. Do you know how to resolve rhis issue?

hello