Escape the guards:
When you are outside at night and you find you are about to get caught, try the Nimbus 2000 Broomstick. You will not get a penalty (no -housepoints), only saying go to your`s bedroom and then you are outside the castle. You can get the Nimbus 2000 when you win the first session of training of the broomstick game and you win.
(supplied by: Riku)
Ghosts:
When you see a ghost press L1 and X and they will pass you.
(supplied by: Riku)
Easy beans:
Get unlimited beans by going out of the griffindor tower and hiting that object with flipendo and get 3 beans then walk round the corner 3 steps past and come back, hit the object, so on and so on..
(supplied by: chocobo)
Avoid the prefects:
When you are trying to sneak out at night, if the prefects see you they will try to freeze you with a spell. Just equip Expeliarmus, because you can use it on them and run away as fast as you can.
(supplied by: ardenriddle)
Wizard card:
If you go outside onto the Hogwarts grounds (after you have learned Incendio) fly around the rooftops until you see one with a bunch of those torch pillar things on top. If you light all of those with Incendio, you get a chest, and inside there is a wizard card.
(supplied by: ardenriddle)
Wizard card:
Fly around the rooftops on the Hogwarts grounds until you see a boy standing on an upside-down "p" shaped roof. There, for 5 beans, you can try to break the record for throwing gnomes into rings. If u break the record (you have to get more than 10 - it's really easy), you get a wizard card.
(supplied by: ardenriddle)
Hints:
When you first get to Hogwarts, do not go right to bed, use the time to get all the wizard cards from the twins. You have free run of the castle on the first night. Also check the desks in the classrooms, the ones without benches. The class room on the 7th floor will allway give 12 beans, just go into the class room search the desk on the left at the back of the room and the desk on the right at the front of the room and get 12 beans. To refill the class just go to the main staircase and come back. Takes some time due to loading but worth it to get all the cards the twins sell to add to your collection.
Deduct House Points From Slytheryn:
When Hermione gives you the Polyjuice Potion and you are on your way to Slytheryn Common Room, let the prefects catch you. It only works 4 times. At the end of the game they should have 410 points.
(supplied by: emily)
Beat the Whomping Willow:
When battling the Whomping Willow, don't atack when it has the car in it's hand, or when it's mouth is closed. Only dodge. To open its mouth, get close to it. Only then should you do a fully-powered magic blast.
(supplied by: naparnx2)
200 bean bag and 6 wizard cards:
There is a boy standing outside during daytime and talk to him. He will ask you to do a favor for him. Once you have done it, he will direct you to another student and you do favor for him as well. Same thing and you talk to about five or six students and run errands for them, finding their items. This is not the message board items lost. After you have done everything for the other students the last student will give you a key to the confinscated room. That is the room in the cloisters. (Area next to flying lesson...a patch of grass and a square area). Inside there are a seven chests which contain a 200 bean bag and six wizard cards.
(supplied by: dolphinzgamez)