@kotryna
I don't want to be too detailed on the puzzles itself not to spoil too much accidentally :D but we have some huge ideas in mind where each person would be able to contribute to only certain amount of puzzle to resolve, so that'd bring X people to work together and it would not work without the collaboration part. There for the first to solve their own grounds a spot, and only by bringing more friends together could reveal the solution.
Do you guys have any particular ideas on the educational part? I'd love to hear those, we'll have bunch off different puzzle trees - i'm pretty sure we can incorporate so many different narratives