No one else has nominated it, but I'll pipe in here as I always do and say that III was my fave. The mix of puzzles, battles, long forest adventures and insane alien technology blew me away at the time (I was like 6, I'll admit I couldn't finish the game... pre internet walkthrough days
![smile :)](/forums/images/smilies/smile9.gif)
) and I've repeated the game every few years since then when I forget the details.