difficult / hard, probably impossible

solve (a problem); answer (a question); unravel (a riddle) / comb; untangle (hair)

untie; unravel; undo (a fastening); unwrap / dispel (doubts); clear up (a matter)

Alternative form of なんぞ (nan zo)

a type of riddle with set wording where the solver must find the homophone that relates to two otherwise unrelated statements

puzzle-solving (activity)

riddle / puzzle / enigma / hint / tip

seabed

mystery; puzzle

(informal) "mystery meat", specifically the meat-based product found in Nissin Cup Noodles