Crest Roundup
You can find extra Crests when you've completed Harry Potter's adventure. At some places in Hogwarts you can find firework boxes. If you burn these with Incendio, they will explode and a broken Crest will pop out. Repair it with Reparo and pick it up. (For instance, check out the box nearby the duel club of Hufflepuf)

Amassing Mini-Crests
Description: You can get a large amount of Mini-Crests when you have used the Luck Potion and are making your way to Herbology. At this point, every time you use Diffindo to get the Mini-Crests to appear, you will get the full amount of Mini-Crests available, due to your increased luck. Get as many as possible at this point to help reach the 25,000 pieces goal.

Duels
How to: An easy way to win almost any fight or duel is to cast Levi Corpus or Petrificus Totalus. Now, just charge your Stupefy until it chimes twice, and release it. This will result in a one hit victory until later in the game, then it will require two. *** This does not work on Fenrir
Greyback.

Locked Gates
Description: When you see the shields behind the locked gates, use Wingardium Leviosa and hit it into a wall to break it. Lift the pieces out through the gate and repair the pieces to get a shield.

Castle Gates
How to unlock: To unlock the Castle Gates multiplayer dueling area, enter this code at the Rewards Menu:

RIGHT, RIGHT, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT, LEFT, RIGHT, START

Hogwarts Crest Rewards
Description: Collecting the Crests hidden around Hogwarts unlocks the following rewards:

3 Crests	Two Player Dueling Pack 1: Draco & Luna
8 Crests	More health in duels
14 Crests	Two Player Dueling Pack 2: Training Ground Dueling Arena
21 Crests	Dungbombs in prank boxes around Hogwarts
29 Crests	Two Player Dueling Pack 2: Crabbe & Goyle
38 Crests	Score boost in flying events
48 Crests	Exploding Cauldrons in prank boxes around Hogwarts
59 Crests	Two Player Dueling Pack 4: The Transfiguration Dueling Arena
71 Crests	Max health in duels
84 Crests	Two Player Dueling Pack 5: Ginny & Hermione
98 Crests	Love Potion in Potions Club
113 Crests	Two Player Dueling Pack 4: Paved Courtyard Dueling Arena
129 Crests	More mini-crests with each cast
150 Crests	Multiplayer Dueling Pack 7: Severus Snape

PS3 Cheats for Harry Potter and the Half-Blood Prince

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