Currently, tens of millions of people all over the world play casinos every day. Numerous virtual casinos offer a wide selection of a wide variety of entertainment. To choose the best model in this huge assortment in terms of excitement and chances to win is not an easy task. There is no single criterion, for this reason it is necessary to take into account a number of certain factors and only after that make a decision. Another important criterion that you should pay attention to when choosing is its functionality. This concept includes the main and additional options - a double risk game, free spins, the ability to take part in progressive jackpot draws, various bonus and thematic games, etc. The more auxiliary options, the higher the probability of winning.