The game is too simple. You should not buy it.
You choose the chapter and then the character possible. It starts with an introduction using cutscenes from the movie. After passing it, another chapter is unlocked + experience points that may level you up and help "buying" moves. It's always like that until you get the final chapter.
During the game, you must fight with different kind of monsters, some of them are harder to beat, but that's okay. Fighting is the combination of pressing the buttons in some order. You get also a "list of movements". I never checked it out. Just press the "x" button.
I had a good time with my sister playing it, laughing, etc. The problem begins when on some of the chapters, you must act quick to survive or you must do it from the start! It's very frustrating when you are playing with somebody else, because you have a limit of distance between your character and the other. There starts the fight of: "you were supposed to be on the other side" or "I was wanna kill that monster"...
For finishing, I recommend you this game if you have read the book or if you watched the movie. You can unlock some interviews about what do the actors think about the game.