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beat the first level and press return to leaky cauldron.
it is down diagon alley and is the third store that you can enter after the leaky cauldron.
On Lego Harry Potter Years 1-4 wii It's in the Leaky Cauldron beside the stairs. You have to use reducto on the lock.
Do daigon ally and and the first place you should go in that part is the leaky cauldron.
You have to go to the upstairs of the Leaky Cauldron.
isn't it gold bricks you need?
go in the leaky cauldron and redo the charms levels then complete it go back into the room and find them. Enjoy
go to the door that leads to London train station and press contine story
You find all the ingredients to the potion that is in a gold cauldron by Harry's bed.
To play bonus levels you go to the Leaky Cauldron(which is accessed from the pause menu during play time) and from there walk through Diagon Alley to Gringots. There you should be able to cast a few spells to get into into each vault for a bonus level. To repeat a level go to the Leaky Cauldron and there should be a notice board to repeat certain levels. Hope this helps!
If you are speaking of the snake for a potion in Lego Harry Potter 1-4, there are a number of potions that have this item as an ingredient. Let us know where the cauldron for this potion is, and we can tell you where to get the snake.
There is no tube on Lego Harry Potter.