Singapore Airlines have released some games for you to unlock promo codes and I have been playing last week. My main aim was for Denpasar (Bali) but not sure if there isn't or I have yet to unlock it. Please do share with me if you have it.
Sharing with you what I have got so far.
Prices for return tickets are as follows but note that you have to book by 02 January 2019 and pay using MasterCard. Travel period is 7 February 2019 to 13 June 2019.