Intellectually challenging
and
Intellectually stimulating
htrek Intellectually challenging A puzzle that is very difficult to solve. htrek Intellectually stimulating A game, puzzle, book, or work of art that causes one to think, but without frustration.
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htrekIntellectually challenging
A puzzle that is very difficult to solve.
htrekIntellectually stimulating
A game, puzzle, book, or work of art that causes one to think, but without frustration.