Simply the best sequel to the best game ever made in the Adventure-game Genre!
Even 10 years after playing it, I still remember having to learn how to master sword-fighting by using witty jokes, and finally meeting the (ultimate) Sword-Master who you had to think critically to beat. There wasn't a single game of Monkey Island though, that I didn't need the cheat-books with me when I played... The puzzles were just amazingly complex, so unless you felt like trying every possible combination to something, you HAD to use a cheat-book.