conundrum

CONUNDRUM noun

[ C ] uk/kəˈnʌndrəm/ us
a problem or question that is difficult to solve

головоломка

№2 (2449)№2 (2449)№3 (2359)№4 (2354)№5 (2346)№5 (2346)№5 (2346)№5 (2346)№6 (2318)№7 (2316)№8 (2314)№9 (2310)№9 (2310)№10 (2302)