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The above video contains a walk-through for Harry Potter and the Philosopher's Stone on Game Boy Advance (GBA).
You go to character shop and you walk into the dressing room on the left.
Universal Studios is split into two parks: Universal Studios and the Islands of Adventure. The Wizarding World of Harry Potter is inside Islands of Adventure so you will have to walk through the park to reach The Wizarding World of Harry Potter.
Yes, you will walk through Dumbledore's study, and several other castle areas on the way to the Forbidden Journey.
You can't get past him, you have to go through to the divination classroom, and the junmp through the trap door and jump on him and he will be defeated.
A walk-through for Harry Potter and the Philosopher's Stone like the one above, can be found on YouTube or Game FAQ's.
A walk-through for Harry Potter and the Philosopher's Stone on GameCube can be found in the video above. You can also see text based ones on Game FAQ's.
The walk-through below has a list of all the secrets to be discovered during the game. http://www.gamefaqs.com/pc/562014-harry-potter-and-the-chamber-of-secrets/faqs/20211
Please see the following walk through for details on the secret areas. http://www.gamefaqs.com/pc/562014-harry-potter-and-the-chamber-of-secrets/faqs/55157
When you unlock parseltongue, you have to tap on the snake and then you have to talk into the microphone.
The Harry Potter and the Philosopher's Stone video game was released for both Game Boy Advance and Game Boy Color. The above video is a walk-through for GBC that shows you how to get the bloomslang skin.
Walk-throughs for Harry Potter and the Philosopher's Stone, like the one above, can be found on websites such as Game FAQ's or YouTube.