Hints: 

To get the three last Witches and Wizards cards. When in Gringotts bank on the minecarts, there will be certain directions which have a gem behind the coins, if you collect all the coins, the gems will appear, collect all of these as well and you will be rewarded with a card. On the knuts level there are 65 gems to collect, on the sickle level there are 55, and on the galleon level there are 65! It's a lot of work and took me ages, but worth doing, as with 17 cards you get an alternative ending.
Send in by: eesa_p@hotmail.com

Alternate Ending:-  When you have beat the game the credits will start, and run for several minutes. When the credits are finished you will told who truly has one the Hogwarts House Cup and if you have collected all 17 Famous Witches and Wizards cards the game will give you an different ending. 

Climbing bookshelves:-  If you approach a bookshelf and find that you cannot climb it, press Square on a piece of a wall that is different or lighter color.

Get Extra Coins:-  While in Gringotts Wizard Bank, In the Galleon roller coaster ride turn upside down after the few wooden traps to get as many coins as possible. Sent in by: Walid Kayali - Age 10

Unlock all doors. Pause the game and press, up, right, down, left, L2, R1.

Bertie Bott's Beans - Collect the following amount of "Bertie Bott's Every Flavour Beans" to unlock an item behind a portrait at Hogwarts: 
50 Yellow Beans: Nimbus Two Thousand 
70 Blue Beans : Quidditch Armour 
80 Green Beans: Famous Witches And Wizards Card 
100 Red Beans: Advanced Flipendo Knockback Jinx 

The Giant Chessboard - When you come to the giant chessboards near the end where you have to get the pieces to kill each other to win, do this. First Board (the one with green fire): start on the right square: go up, diagonal up-left, diagonal down-right, diagonal down-left. Second board (the one with blue fire): start on left square: go up, diagonal down-right, left. Third Board (the one with red fire): start on left: go left, diagonal up-left, diagonal up-left, right, diagonal down-right.

Control Main Menu - At the main menu, press Triangle to cause a lightning strike. 

Hidden passages - There are secret passages out in the hogwarts grounds (looks like a discolored section of wall).

If you walk outside the school and you see a wall that is different than the other walls you must go right in front of that wall and press square and then that wall will open.

Feather - To get the feather at Eylops owl emporium, pick up the the treats and throw them at the owl in the center.

At the main menu press triangle to cast a lightning strike. Some walls can be climbed if they are near bookshelves and are a different colour.

Hidden Witches and Wizards Cards - To get witches and wizards cards go to the forest and look for different coloered walls. Go up to them and press square. When you are inside look up in the little foyer thing and hit the card with the flipendo jinx. 

When your inside the castle go to the dungeons and go through the middle door. Use your verdimiiluos spell to get the floating platforms. Run real fast to the ledge on the opposite side and go through the door. When you go through go up to all the bookcases (even the one on the ledge) and press square. Inside you will meet Nearly Headless Nick and he will give you a challenge beat it and you will get witches and wizards cards. Then go through the other door and do the same thing you did before.

Their are 11 secret locations where you can get wizard cards. Indoors look for thin bookcases.

In the Forbidden Corridor Look for areas in corridors in between tasks/rooms. In Castle Grounds look for diffrent colour blocks on the walls. To open the areas simply press square.

When you have completed flying lesson and attend a different class, go back to the flying lesson. Go in and catch all the "glowing butterflies".  You will get 20 or 25 house points.

Opening bookshelves - At Hogwarts there are bookshelves you can open and get prizes. 

There are 2 in the Great Foyer.  There is also 1 outside the Gryffindor Common Room. The nearest bookshelf to the portrait of the Fat Lady can open up.

Devil's Snare - First - Hit the tentacle that turns light green [quickly] until all of them [except the middle] are gone.

Second - Run around on the green part of the floor and do not get hit. After the middle tentacle misses you, hit it with a charged Flipendo.

When you get to the part with the Devil's Snare, hit all of the light green tentacles and they will wilt and disappear. If you hit a dark green one, they will all grow back. Then, you must defeat the big tentacle in the middle.

Potion lesson - When going through the potion lesson, you will be approached by a dark figure. It will make you fall down a level. When you get to the part with the bubbles, go to the top level of the room. Press Square to go into a room where Nearly Headless Nick is. He will tell you to push the cauldrons. When you complete this task, he will give you a Famous Wizards And Witches Card. Go out of the room, then enter again. Do the same thing with him. Each time you do this, he will give you a different Wizards And Witches Card. Also, check out the other bookcases in the castle that you cannot climb.

Defeating Malfoy - You will face Malfoy in the entrance hall. To defeat him, throw back any Wizard Crackers he throws at you. Throw enough and he will die. Watch out for Crabbe and Goyle, who will defend him.

Defeating Voldemort - After drinking the Ice Potion, you will go in a room with four suits of armor. The cloaked figure will say I wondered whether I'd be meeting you here Potter. You're far too inquisitive to remain among the living. You must defeat the four suits of armor, then you will face a large suit of armor. Defeat it, but avoid its sword's ray. Rocks will fall, including one that takes off Quirrels Cloak. He will then say Damn you Potter. But, Master. it wasn't my fault. You will cross the bridge, drink the Wiggenweld Potion, and follow him into the room. The Mirror Of Erised will give you the Stone. Press Square to escape the ropes and Flipendo the poles. Then, shoot Flipendo twice inside the mirror after avoiding his green spells. He will pin you on the ground. Press Square to power up. Press X when prompted. After awhile, he will scream and you have won.

Defeating the last Troll - Run as fast as you can until you get you get to an object that can be used with Wingardium Leviosa. Then, use the Charm, move it to the side, and let it drop. When it gets to thebottom, press Triangle. Keep doing this until all of the objects are on the side and you should see a hole. Jump over the hole and wait until the Troll falls in. Then, go to the door.

Keeping Troll asleep - When you are in the dungeons for Snape's class, you will meet a sleeping Troll. In order to keep the Troll asleep, you must Wingardium Leviosa the basket with the key onto the haystack next to it.

Grabbing the Snitch - When the Snitch is about an inch away from your hand, grab it. This may require a few attempts.

Behind bookshelves - Behind one bookshelf you have to shoot pumpkins, cauldrons, and chocolate frogs with your Flipendo. You will have to shoot them back for a Slytherin. This is located in the Slytherin door across from your door in the entrance hall.

Find secret areas - If there is a bookshelf that you cannot climb on, press Square and it will open. You will find different things that will help you inside. Also, there are parts on the castle walls outside that can be opened. To tell if the wall can be opened, it will be a lighter color. Press Square to open it.

In the last part of the game, after defeating the Devil's Snare and several other tasks, you will pass through a passage onto the next task. In these passages are secret doors, on the right hand side of the wall. They are a slightly lighter color than the rest of the wall. To get inside them, press Square. Inside will be Chocolate Frogs and a book that lets you save the game.

You can go through the two castle walls that connect to the right of the entrance to Gargoyle's Gate, on your way to the Fire Seeds. When you get to the small cemented area, press Triangle and look straight up. There should be a witch or wizard card there. To get it, aim a Flipendo at the card.

When you get to the Dark Forest, go to the clearing where you Incendio the steps up to the clearing where Voldemort is located. Go the other way and follow that path. When you get to a door, go through to find beans. Press Triangle and look up to find a witch or wizard card. To get it, cast a Flipendo at the card.

When you first enter the Dark Forest after you talk to Hagrid, go to the left of the clearing. There should be a wall of trees that look differently than the others. Cast a Flipendo at it to get through. There should be another one after it. Do the same to get more beans.

There is a bookshelf by where Fred and George are located, outside from the portrait of the fat lady. Go up to it and press Square. Inside will be a Famous Witches and Wizards card [Merlin].

House Cup - Although you may think you have lost at the end of the game, defeat Voltamort to win the House Cup.

House Points - Shoot spider webs and anything else with a glowing sparkle above it to get House Points.

Blue Beans - When you go through the tunnel doorway after passing the well where the boy is looking for his kitten, you will see a yellow bouncing Puffskein. If you lead him to the brown prickly bushes [do not touch them], it will eat and start popping out Blue Beans.

Owl shop - When in the Owl shop on Diagon Alley and feeding the owl, be careful of the owls flying around the one you are trying to feed. If they get near the food, they will eat it in midair causing you to start over.

Go flying - When you are trying to knock Trolls down wells with Hose Puffer things that make them sneeze, you can go flying/ Throw one of those at them when they are over the well to make them sneeze. Before they sneeze, run over and stand next to them on the gate. They will fall down the well and you will go flying in the air before landing back on the ground.

No chasing Malfoy - Win the Quidditch cup at the main screen before you start a new game. You will not have to chase Malfoy for the Rememberall.

Sloth Brain for Snape - First, get the Fire Seeds for Hagrid, which will open the gate behind his hut. Go through the gate and follow the path
until you find Ron Weasly. Follow him to the Quiditch Pitch. While he is talking, Neville Longbottom will appear. Ron will say Hey, here comes Neville. He looks quite upset. Best go see what he wants. Harry will go to Neville automatically. He will say Malfoy stole my Rememberall and ran onto the school grounds with it. Harry will automatically follow Neville. Malfoy will speak and you must defeat him. He will speak again and throw the Rememberall and Harry will catch it. Professor McGonnagal will appear and speak about Quiditch. You will go to the Quiditch Pitch where Ron, Hermione, and Hagrid will wish you good luck. Once you finish Quiditch, you will run into Snape who tells you about the missing Sloth Brain. He will confiscate your Quiditch Through The Ages book and a map will fall out. Walk over to the map and Ron will appear and speak. After that, you will follow him to a gate. He will unlock it and you will walk inside. Once inside, go straight and turn left to the Puffapod Patch. Ron will speak. Next, you need to find the tunnel that leads to a Venomus Tentacular. Defeat the Tentacular and proceed. You will find a lever. Use the lever and return to the Puffapod Patch. The door behind it will now be unlocked, Enter the door and defeat the Horklumps. The Sloth Brain is past the Horklumps on a tree stump, Pick up the Slot Brain and jump to the bush in front of you. Jump off the bush and you will be near the lever from earlier in the area. Go to the gate and return to Hogwarts.

View game completion - When defeat Voltamort the game credits will begin. Try to go back to your saved game. Although you cannot start it again since Voltamort was defeated, the game will display the percentage that was completed.

Unlimited Advanced Flipendo - Start more than one game and save them. In one of the saved games, get Advanced Flipendo by collecting one hundred Red Bertie Botts Beans. Go to a save game book. Save it, then go back in the book. Save on the others. You should have the Advanced Flipendo on the other games.

Game Shark Codes:

Have All Blue Beans 800827f2000f 
Have All Green Beans 800827f60100 
Have All Red Beans 800827fa0100 
Have All Spells 3008268500f0 
Have All Yellow Beans 800827ee000f 
Infinite Health 800829648000 
Press L1 For Lots Of House Points d0078d0efbff   800827dc7000   d0078d0efbff   800827de003e 
Stop Timers 8007b5380fa0