Okay! We’re off the RPGs and onto action/adventure game hybrids!

This game is a personal favorite of mine; I played it all the way through from beginning to end. It was a very well-designed game with a huge world and a fascinating storyline. It helped that it was based on a series of books by a real author and that the author was intimately involved with the creation of the game. She even went so far as to say that the game is the true end to the story, rather than the one presented in her books.

Oh, that's definitely Quake.  You can tell by the shape of the gibs.

Name and developer, please.

EDIT: Wow, I seem to have finally stumped you guys!

EDIT: Okay, I’m giving you guys until 12 PM Eastern and then I’m going to reveal. Warren, you are now allowed to guess, if you so desire.

EDIT: Okay. Wow. No one got it. The game is Below the Root, by Windham Classics. It’s based on the Green Sky books by Zilpha Keatley Snyder. In the last book of the series she had one of the main characters die, which she realized after the book was published was a mistake. So the plot of the game is to actually find out if this character is really dead, and rescue him if possible.