This is one of the best portable HP games.

User Rating: 8.5 | Harry Potter and the Philosopher's Stone GBC
This game is awesome. Yes, it's old, but it was so much fun for me when I was younger. It's one of the four RPG's I like and is great. Gameplay: Great stuff. You level up (I got to like Level 60, I think) and cast spells in battle. Sometimes it can be annoying, when there is multiple creatures on screen and you run into battles way too much and you might die and have to restart it, but it's still amazing. You only have control at Harry and both Ron and Harry once during the spider fight. You also get to go class. Mostly all you do is collect things, but all do vary a little bit from another and is fun. Graphics: Nice character models and animation. All the different Hogwarts students have (sort of) their bodies and faces and everything different. The environments are pretty good, and are all bright and colorful.
Sound: This is the down of the whole game. The music itself is good, but of course it doesn't have voice-overs, so most of the time, it's sort of soundless. Value: Really great. I played this one for a long time and had great time with it. Overall, this is an old game, yes, but anyone that likes Harry Potter will like this.