Harry Potter And The Sorcerers Stone

Hint: All card decks:
To get all the card decks from the beginning of the game, defeat Voldemort four times.

Hint: Getting rid of Peeves curse:
When he sets the curse on you, go to the fifth or sixth floor and go to the upper left door.
Go through a TV and battle.
Once you win, you will get your present back.

Hint: More herbs:
Stand in front of a piece of grass where you get herb plants.
Pick it up, go into your menu, and exit out.
More herbs will appear there.

Glitch: Phantom conversation:
When going to Snape's Potions Class, note that the Weasley Twins are still in the Common Room.
Press Start and walk to where they where standing.
Press A and you will be talking to them, even though they are not there.