Mystery of black box lite

The "Mystery of Black Box" is a brain game.
The Black Box is the most powerful magical artefact, which turns one things into other. Hapless hero turns into an ugly troll and now has to unravel a mystery of the Black Box to become human again. Waspish cockroach Ibrahim, the guardian of the black box, is supposed to help him in this complicated matter.
The game consists of puzzles, in each of which the player can put into the Box up to 3 different items. He has to figure out how the Black Box affects them.
The question is - what is inside the Black Box? For example, what object inside the Black box splits cup to fragments and drives nail into the board?