I can't see a misstake in 2/16, the whole truth. PM me what you mean please.
S2e13 should be fixed now, thanks. Try it again please =)
About the difficulty, 4 Seasons are out YET. But totally there will be 6 seasons.
So there's enough space to made them harder and an easy beginning with season 1 for the people with less experience.
When i'm finished with season 4 there will be some extra challenges for each season.
Greez