Vanishing cards, what the heck are they and how do I get them?!? I have finished almost the entire game (except Voldemort and the third task) and I still have yet to find one? Can anyone help me please?

They're essentially cards that vanish after a while and they're pretty hard to get. All you can do is look.
To get you started:
Hogwarts Exterior
Run down the first set of stairs,turn left and run to the far end of the screen where the three blocks are. There is a gap in the wall beside the cliff. Run down and grab your first vanishing card. NOTE: You have to do this quickly or the card vanishes(what a surprise).
Now that you know what they look like you'll spot them a lot easier.
Keep it cool

Thanks. I too have been looking for the vanishing cards. Any other tips on their locations in different levels?

Anyone had any further luck with cards?

I know on Moodys challenges, the 3rd challenge, destroying the walls with the pots, when you start it, grab a pot and destroy the wall directly in the middle, then walk round it. The card is behind it.

Hope this helps.

I looked for hours for this one!! I finally got it!! Thanks so MUCH!!!

How do you get one in herbology and the prefect's bathroom?