Where is the 15th Famous Wizards Card hidden and how do you get it?

I haven't completely finished the game(dam hippogriff LOL) so i don't know if it's revealed then...

But if you go to the clock tower courtyard, right outside. Then facing the tower, go to the R side, there's a "hole" on this side but not the L... and if you look up you can see a hole in the wall but way up.

To see it.... if you spongify up to the "falling roof" next to it then turn right back down and come down the hole, there's a "glitch" and you land on the wooden "door" holding the spongify thing up in the "hallway"

once on the "door flap" if you spin your mouse so the view changes, I can see a wizard card up there... and on the grass below it if you walk over there...you can see a square that looks different from the rest...like you have to spongify up there but only because you see the "glitch" in the grass

I see it hidden, but no idea how to get up there...

U can get that if you cast lumos at the gargole then the spongify tile will appear

You will need to get 74/80 cards then go to fred and gorges shop to get the 75th card then the game will take you to the bean bonus room fo the last time and there you have unlimted time so you can colect the last 5 cards and all of the beans/pumpkin pasties and the caldron cakes.

Hope I helped

If you only miss that cart, you are done with the game, the only thing you have to do is going to Fred en George store en you'll see the cart! Then you may go to the bonus room and you'll get the 5 bonus carts.

Greetz