Half-Blood Prince brings a new view of Hogwarts! You can explore the entire castle! Just play it and become a Wizard!
The gameplay is just like the Order of the Phoenix game. But the duels are better, more dinamic, the spells are cast with less touches in the Analog Stick... Example: To cast Stupefy, you just press up in the Right Analog Stick... And Protego, press down...
There are lots of secrets in the castle. This time you collect mini-crests all over Hogwarts to make Crests and unlock several secrets!
The Quidditch gameplay is similar to the one on Sorcerer's Stone in Playstation (well, I liked)...
The only bad thing is the game is to short (if you choose to do every primary mission), but after beating the game, you can explore the entire castle to unlock secrets you didn't during gameplay.
My last word on this game is: "Is so cool! You must play it if you are a Harry Potter fan! And if you are not... it's a cool action game to enjoy too"