This is the 11093rd most frequent Russian word.
головоломку
Puzzle.
Here, 'головоломку' refers to a challenging problem or puzzle that was solved.
Он решил сложную головоломку.
He solved a difficult puzzle.
Here, 'головоломку' refers to an object designed to entertain or challenge the mind, which was given as a gift.
Она подарила детям новую головоломку.
She gave the children a new puzzle.
Here, 'головоломку' refers to a purchasable item that entertains or trains cognitive skills.