Adventure Games
My favorite adventure games are the SCUMM games by LucasArts (as well as Grim Fandango and Escape from Monkey Island), and the episodic games by Telltale Games. I also like the Broken Sword series and Beneath a Steel Sky by Revolution Software.
Here are the adventure games I completed. I don't collect games anymore, so most of the adventure games I have aren't in boxes. Most of them I got through digital distribution. I just enjoy playing the games. :)