Harry Potter and the Prisoner of Azkaban is EA's game based on the third movie and book in the Harry Potter series. The big difference with the previous game in the series, Harry Potter and the Chamber of Secrets, is that all three main characters are playable at once. All characters have a speciality; Harry is the agile one, and he can do such things as climb on ropes and leap over chasms the others can't. Ron can find secret passages the other characters cannot detect, and Hermione can squeeze through small openings in walls the others can't get through.
The player takes classes in the game that are pretty much dungeons and at the end of each one, a spellbook is given that unlocks a new spell, usually an offensive one or a spell that helps get through obstacles.
While not taking classes, it is possible to freely roam Hogwarts, which has been expanded upon since the last game. There are also minigames like flying a hippogriff, and interacting with other pupils in the school can lead to odd jobs to do. There is no more broomstick that allows the player to fly around Hogwarts' grounds like in previous iterations.
There are also eye-toy mini-games, including a snitch capture one.