If its Baking powder one, its a lot difficult (TRUST ME)
You need a Fake Mini mountain about side of 40x40 CM sq from the base.
And you need to put a bit hole, which will also have a base of about 15x15 cm sq.
and in that you need to put baking powder and soda togather and it will come out and You have a Valcono ^_^
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