If Neverwinter Nights 2 was a movie, it'd be a typical summer blockbuster. After all, last year's fantasy role-playing game was packed with tons of colorful characters, humorous dialogue, and, above all else, nonstop action as you battled your way through the game. On the other hand, Neverwinter Nights 2: Mask of the Betrayer, the newly arrived expansion, is a much darker and more cerebral experience. There's not that much comic relief, and there's a lot more puzzle-solving than before. That's not to say that it doesn't feature plenty of action. In fact, it's packed with titanic battles. However, the tone is a lot more serious.