Hint: How To Get Fairy Wings:
When you have to collect Fairy Wings as part of your homework assignment for Professor Snape you will get the chance to go to Hogsmeade (The Woods outside Hogwarts). When the fairies come out, use Hermione and cast the Flipendo spell (KNOCKBACK JINX) and if you hit them then they will fall to the floor. You then have to use the Glacius spell and freeze the fairies, then walk over and pick them up.

Hint: How To kill A Salamander:
To kill a Salamander first use the Glacius spell to put out the fire on its back and to turn it icy and then shoot it with Flipendo (Knockback Jinx).

Collector card bonuses:
Successfully complete the indicated card set to unlock the corresponding bonus:
20 House Points All Beast Cards
20 House Points All Vampire Cards
20 House Points All Giant Cards
20 House Points All Goblin Cards
Harry gets extra endurance All Quidditch Cards
Harry gets extra endurance All Wizard Cards
Hermione gets extra endurance All Witch Cards
Hermione gets extra endurance All Hag Cards
Ron gets extra endurance All Dragon Cards
Ron gets extra endurance All Classical Beast Cards

Win Broomstick:
On the second day of school it tells you to go to the Quidditch practice, so go there. Now. Complete the training and get a B or higher, and the captain guy gives you a free Nimbus 2000 flying broomstick! You can fly anywhere around the school, only in day-light. You can't land anywhere except where you took off from. (Note: You can't fly in the school!)

Unlimited Bertie Blotts Every flavour beans:
Ok so when you get to Hogwarts you'll need Berty blotts every flavour beans. So collect as many as you can before goin to hogwarts. try to get 50 because you need it. When you get to Hogwarts buy the Beans Bag so it can hold 100 beans. When you go out of the gryffindor tower you'll see a thing in the corner. Hit it with Flipendo and 3 beans will come out. Hit it again and no beans will come out. Now go around the corner (3 steps after the corner) then come back. Hit the thing again and then 3 beans will come out. Repeat the process and then u will be able to get Alahamora ^_^

Gargoyle in Backwash:
Go to the big building in the middle of the map. Look above the doorway. If it is not there, keep going around the building until you see it.

Get stuck in ceiling in Relic:
Push a barricade into the rock near the teleporter, next to the large broken tree. Position it so that the part that you stand on is half way into the rock. Stand on the barricade, in between the rock and the barricade. Have three other players shoot the barricade to launch you into the air, just like on turf; sometimes you will get stuck in the ceiling. Note: It may help to be the Connection Host.

Foundation Multilplayer Map (w/ Glitch):
Unlock the hidden Foundation level by completing the single player campaign on any difficulty. Due to a serious glitch in the game (and one that will not be corrected), you will need to do the following to unlock the Foundation map for a specific profile:

1. Start a co-op game with a profile with access to the last episode (The Great Journey) and a completely fresh profile (i.e., one that has not even started the campaign game).

2. Fight to through the last episode until the players need to board Banshees to progress.

3. Have the new profile player perform a barrel roll (both directions) and a Loop-the-loop (stick down and A button).

Secret Cave:
There is in level 5 a secret cave at the button of the map entrance. It comes out on the side where they are not expecting a side attack from that side and it shall be easier.

Get New Ending Sequence:
Finish the game using legendary difficulty setting in Campaign Mode

Carry 3 Weapons:
OK to carry 3 weapons u have to beat the game (i beat it on easy) then when ur done u can carry 3 weapons

Battling flood:
Using a combination of assault, Shotgun, and grenades works best...
Warning: Only use the [sticky] grenades at a far distance, especially for the little ones.
Shot gun- use on big floods, and little floods.

Getting past turrets and other dangerous enemies:
When you need to run a long way and you have some objects with you (for example, a non-explosive barrel), if you have the gravity gun, use it as cover and run (while facing the enemy) to the other side. Then if possible, shoot the barrel at the enemy. Note: Make sure there are no more that one enemy while doing this. Also, make sure that the object is indestructible, and most importantly, look at the enemy and see if you can kill it with one shot.

Spawn medpak:
While playing a game, press Up, Up, Down, Down, Left, Right, Left, Right, B, A to spawn a medpak that will restore 25 points of health.