Easy: Trail of Cthulhu.
I love me some investigative occult horror. My players, sadly are sick to death of it because they don’t like the idea of bad things happening to their characters. The worst part is that we’ve never, ever even played Call of Cthulhu in any format before. However, I did borrow many themes from it and Silent Hill and import them into Dark Heresy.
The GUMSHOE systems is super cool. Probably some of my favorite game mechanics ever. I would really, really like to play this some day. Oh well.
Here is the official page on the Pelgrane Press website.
26th – Coolest character sheet
27th – Game You’d like to see a new / improved edition of…
28th – Scariest Game you’ve played
29th – Most memorable encounter
30th – Rarest RPG Owned
31st – Favourite RPG of all time