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Harry potter and the prisoner of azkaban does very well when it comes to graphics, and the characters bear some resemblence to their film characters. Another good thing about the game is the sound, espacially when it comes to characters, the characters voices very close if not the same as the ones in the movie which helps set the game atmosphere( I find it especially annnoying when the characters have a different voice then the one you expect, it just makes it hard for the player to blend into the game atmosphere).
Another good point is the game environment, Harry Potter and the Prisoner of Azkaban gives you that magical hogwarts feeling starting with the moving staircases to the way everything is captured with great detail,which just makes roaming around good for once(This is usually not the case).
The powers are also quite amazing, and they are especially fun to use in duels. Overall, i think the game succeeds in capturing the magical harry potter atmosphere and provides fun gameplay to make it worth buying.
I think the puzzles could be a bit more challenging, but when you think of it, this is no major issue, especially if you enjoy playing the game.