Especially the simpler version with three stones is to create good, although the specified cosmos recommended age should raise to 12 years earlier - the younger despair fast times and the genius in spatial thinking are hard to beat - these are the weaknesses of the game.
Otherwise: One understands the rules immediately, the quality of the modules is very good and it is also pedagogically well. Disadvantages are the large box and the price - really quite expensive. So overall a very good acquisition and definitely recommend it (even if you do not know the previous versions).