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.
Saudi Arabia is the largest country on the Arabian Peninsula, and famous for being the site of ancient civilizations. Gambling in this country is illegal and prohibited by Islamic laws. Online gambling is illegal as well. Internet censoring is very strict and severe, forbidding all websites that are not in accordance with Islamic laws.