Ghosts:
When you see a ghost press L1 and X and they will pass you.

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.

Easy points:
In the Chamber Of Secrets, destroy paintings on the wall. You will open the painting and get 100 points for Gryffindor.

After returning from the Whomping Willow, head deep to your right when Professor Snape finishes scolding you. There, in a corner, you will find your first Notice Board Item. You can return it to the Notice Board before or after you go to the Restroom Shop the Weasley's set up, earning you the very first 10 points in the game, and possibly a Wizards Card.

Easy Sickles:
Once you have collected your Standard Book of Spells (Grade 2) in Diagon Alley, you can cast Flipendo to break barrels and uncover Sickles that you can use to buy items such as Stink Pellets at Gambol and Japes.

In Diagon Alley, there are three areas where you can break the barrels (using Flipendo) to get Sickles. Remember to revisit these areas several times to get more Sickles. They return three to four times after visiting a few shops.

Bertie Botts Bean Bag (100 Bean capacity):
Use the Skurge spell on a chest covered in ectoplasm behind a tapestry (you need the scissors spell) on the third floor, by the Defense against the Black Arts classroom.

Bertie Botts Bean Bag (200 Bean capacity):
Gather every item for the students around Hogwarts (not the Notice Board). You have to actually find the people. The final person will give you a key to the confiscated items room. In there are six Wizards cards and the biggest Bertie Bots Bean Bag.

Sneaking around at night:
When sneaking around at night, you need to get by many of the prefects. When you need to get by them, simply crawl under the bookcase to the left of the portrait that leads to the Griffondore common room. It leads through a secret passage that takes you to the fourth floor.

When sneaking around and you do not want to walk slowly, you can use various objects and spells to distract the prefects. Stink Pellets are not too reliable, but the non-explodable luminous balloons work well. As for spells, try Flapendo.

Avoiding ghosts:
When you do not want to be hit by ghosts and lose all your items (Balloons, Beans, and sometimes Stink Pellets) just stand on the ledge until the specter nears you. Tap the Analog-stick so that you will fall and catch the ledge. When you are hanging, they cannot hit you and cause your items to go flying.

Escaping the Slytherins:
When you are in the Slytherin common room and need to get out, hide behind the pillar on the right side and wait for the girl to pass. Next, go into the room on your left and stay behind the door. The girl will return and look around. She will not see you. After she walks away, run and jump to avoid being captured. As soon as you exit the room, go to your left. Once there, start running to the door to avoid being captured. This may take a few attempts, as there are many people waiting by the door. Run very fast instead of creeping there -- the Slytherins do not catch on very quickly that you are there.

Expelliarmus Challenge:
Use your spell that cuts down tapestries and ropes on the spiked ball. Walk up close to the edge and hold your trigger button (default R1), charge up for a half second and cast. Note: If you throw the imps into the fiery pits, they will die and you do not have to worry about them. Likewise, if you throw them all away you cannot put them into the cages to get out; but when all are indeed gone, they respawn from that hatch in the wall at the first ramp.

Professor Flitwick's Incedio Challenge:
Once you get the Incedio Spell, return to the main room and make sure the two pillars are down. Go into one of them and switch the flame direction so that the flames are both are on one side of the room. On the other side, use Incedio to light the pigs and Flapendo to point them up to lift the platform; then again on the other one. Run quickly to the switch by the exit. If successful the door, will be unlocked halfway. You will need to do likewise with the other side. Note: You do not have to charge at all -- this gives you a few extra needed seconds.

Fighting with Expelliarmus:
When in one of the few battles with Hogwart's students (just the Slytherin Gang, all others leave you alone), let them make the first shot and bounce it back. Just as you do, use your Flapendo with a quarter to half second charge to knock them back, thus trapping them with two spells to knock back, which they can never manage. Note: Beware, just as you finish casting Flapendo (depending on distance), you will be forced to use your Expelliarmus almost instantly.

Defeating the Giant Mother Spider:
To get to it, use your Lumos spell to light the floor and follow the trail of spiders. Unlike the book, the spiders that are not normal size will try to kill you. Attack them with Incendio. When fighting the Giant Mother Spider, do not try to hurt the spider itself. Instead, use your Incendio spell to burn the web it has attached to the various trees. When done, it will fall into the pit and you will slip in after it. In here, just run around until it rears its head and exposes its soft under-belly. It is the only part that is susceptible to second level magic. Note: It is best to not charge and use rapid firing to get a little extra damage.

Defeating the Giant Mother Spider 2:
While fighting it, you may notice little sacks being dropped and suspended by webbing. Shoot them down with Flapendo and collect health and Bean power ups from Hedwig.

Defeating the Giant Spider:
To defeat the Giant Spider in the Dark Forest, circle around him and cast Rictosempra. He will not shoot any spider webs at you.

Defeating the Whomping Willow:
When the Whomping Willow starts to pound into the ground, hide in the corner where you entered its lair. The shock wave cannot reach you in here, unless you stray too far from it. Should you get hit, you should have refilled your potion Vile before you entered. Also, Hedwig will drop Cauldron Cakes and Beans for your aid. Note: Rapid firing technique is recommended. Lock on to the limbs after they finish pounding and fire a quick shot, then wait to lock onto the Willow's Eye. Then, fire repeatedly until it stops hurting him before running back to your hiding hole.

 

Puzzles Solved
Enter BRCESTN on the Code Input menu to unlock this cheat. This causes puzzles to be automatically solved.

Wicked Punch
Enter FSTOFRY on the Code Input menu to unlock this cheat. This lets Hulk kill bad guys with one hit.

Code Input Screen
Enter these cheats at the code input screen in the Options menu:

Double Health for Enemies - BRNGITN
Double Health for Hulk - HLTHDSE
Half Enemies' HP - MMMYHLP
High Score reset - NMBTHIH
Invincibility - GMMSKIN
Level Select - TRUBLVR
Regenerator - FLSHWND
Unlimited Continues - GRNCHTR


Code Terminal
Enter these cheats at a code terminal in the game:

Play as Gray Hulk - JANITOR
Unlock Desert Battle art - FIFTEEN
Unlock Hulk Movie FMV art - NANOMED
Unlock Hulk Transformed art - SANFRAN
Unlock Hulk vs. Hulk Dogs art - PITBULL

Full Rage Meter
Enter ANGMNGT on the Code Input menu to unlock this cheat. This causes the rage meter to constantly remain full.