@Alfonso - You're right. But I couldn't beat you anyway, you're just too good. And I'm pretty sure I wouldn't ended up as good as second if some others had started the problems earlier.
I tried a similiar search but it did not end on time, and I don't know why.
PD: You're being too modest! I've been pulling all nighters all the week to finish them all, I'm sure it didn't take you all that time to solve them all.
PD2: I've made a problem (44390) in honour to all the suffering and latter satisfaction these 5th anniversay problems brought to me, you should check it out :)