Multiple choice general knowledge culture Which card is valid on trains, buses and ferries in Hong Kong? The Hanaro card The Ez-link card The Octopus card The Oyster card Reveal answer Fill a bubble to check yourself C Correct answer Explanation The Octopus card is Hong Kong's smart card payment system accepted on all MTR trains, buses, ferries, and even for retail purchases. Hanaro card is Korean, Ez-link is Singaporean, and Oyster card is used in London.