The demo on the Comic-Con show floor gives gamers a few options to try out. You can take an easy potions course or an advanced potions course, play a Seeker mini-game, or face off in a wand duel. Now, don't panic; the segments of the today's demo will just be integrated into the story mode. Half-Blood Prince is going to stick with the gigantic, living Hogwarts that you wander around to get missions. The game's even adding changing times of day so it won't perpetually be noon outside and different student moods to accompany those times -- i.e. a kid who is super-energized in the morning might be rundown by the evening.