The worst kind, the answer is not in the game, the game just give you clues that you have to resolve with knowledge outside the game, worst it gives you a timer, right now it's like this: kill bosses, 10 sec to shot some invisible símbols in the right combination, you fail you start over again, the people ho are trying to do this are in the 7 or so level they fail and they have to star from square one.