These are combos of numbers and letters that are given by a casino's affiliate sites to show that a user has satisfied reward terms. Users enter them on the casino site to claim bonus bets and spins. This means that they can get to play some casino titles without using their own money.
Brunei is a developed, oil-rich country in South Asia that is famous for its gorgeous Mosques and architecture. Though it is a strict Islamic state, residents can still enjoy mobile online casino games from the comfort of their homes - only if they are 18+ of course. That applies to both locals and tourists.