Harry Potter and the Sorcerer's Stone Cheats

Hint: Boomslang skin ingredient

When you have to look for ingredients for Snape, if you do not go directly in his office and search the poster and search for the other potions beforehand, the game thinks you already have it and the Boomslang Skin will not be there. To get around this, go outside after finding the other two potions. If you cannot find the Boomslang Skin, go outside and search everywhere for it. You can find it in strange looking bushes, trees, grass, etc.