problem a question raised for consideration or solution; "our homework consisted of ten problems to solve"
sudoku a number puzzle in which the numbers 1 through 9 must be placed into a grid of cells so that each row or column contains only one of each number
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Wiktionary
Substantiv
mystifier -
A person who obscures or muddles information, making something appear to be a mystery.
mystifier -
A situation that is puzzling, or mystifying.