Last year I participated in a fairly elaborate puzzle ARG, where players competed but half convened and discussed over reddit and IRC. I was ridiculously excited during pretty much all of that - had a sense of discovery, suspense, and wonder for the entire three or four days it was on. Put a lot of work and thought into it, too, so it stuck with me and was a really impactful experience.
I'm starting to get the same feeling here! Secrets, surprises, discoveries... so excited!
Uh, I was writing this post to relate it like... surprise letters / breaks in schedule -> EXCITEMENT WHOA, but I think it kind of mostly came of as me gushing. You get it, though.