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@Linda-51 Hi and welcome,
These are done from the data and feedback they receive from the levels, but this is not valid most times as some can do nightmarishly hard levels quite quickly but then a normal level can take many attempt and vice a versa. So everyone gets different views on the level criteria.
You could play a nightmarishly hard level the same as me and you pass quickly and me not, then a normal level i might pass wuickly but you could struggle with, just luck sometimes