A lot of people are stuck, and some might just want the extra 1GB, so I thought this could help. Of course, it contains spoilers.
(I am not the creator of the list, I just found it on twitter after I completed)
Another blog post with slightly better explanations, found this link on IRC.
My wife: "Yes, much better than forcing the kids to open Dropbox accounts."
(Which I did once, when I needed to share a big file!)
Maybe their servers are overloaded?
edit: figured it out. Thanks.
No prizes though :(
I used this. Knew the basics of Sudoku but eh, bit tedious to try and actually work it out for me.
Edit: Doh! I analyzed it too deeply when it was staring me in the face.
edit : there is no step 12 also. But at the end of step 11 one's can read "You must be pretty tired though, so maybe it's time to go home and get some well-deserved rest."
so resting must be the step 12 hehe
Now I'm stuck on 21 and I swear it involves the Dropbox Wiki, but I can't find anything...