hersenbreker (zn):
casse-tête(en) game or toy, or problem, requiring some effort to complete or work out, which is intended as a pastime and/or to test one’s mental ability.
(en) difficult question or riddle., jeu de patience(en) game or toy, or problem, requiring some effort to complete or work out, which is intended as a pastime and/or to test one’s mental ability., problème(en) difficult question or riddle., puzzle(en) game or toy, or problem, requiring some effort to complete or work out, which is intended as a pastime and/or to test one’s mental ability., énigme(en) difficult question or riddle.
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