Statistics is really needed and the need for a clear...

I'm sorry, about clear choice, I disagree with You. In my own experience I can say - started to solve Sudoku as one of the options, and they are difficult for me, but in the process of passing the achieving a new puzzle - filardi, and I switched to them. Perhaps in the future there will be some new puzzles, so let the future players will have more choices.

t98743235 in terms of Achievements, the first 20 types of puzzles that You are starting out and like them or not, You have to finish these , even accidentally started types of puzzles, so I'm asking for certainty in this matter, and not the will of the case, let's call it so About "to solve any of the puzzles a certain amount of" this is another Achievement of the work, the idea of the way good and I "for"!