It’s a way for the game developer to increase the excitement of the game by adding small but frequent wins to allow you to play longer without having to increase your own spendings. The bonus features of the slot machine allow you to play your own money, or the free credits mentioned above, for a longer period of time. It basically allows you to play one or more slot games for free with the same benefits as if you were playing with real money, and you get to keep what you win! Another reason why slots remain the most popular casino game is the availability of “no deposit bonuses”, also called free credits. Having said that, the slot game as a whole remains a simple luck-based game that anyone can play. These “video slots” still have spinning reels but the features of some of the most recent online slots are so advanced that casino sites have begun to create videos to explain their numerous functions. While many gamers find classic slots a bit boring, others find it difficult to understand online slots with different paylines, volatility and bonus features. These simple slots still exist both online and at real casinos and are today referred to as “classic slots”. When the first slot machines were introduced, they only had three reels with cherry symbols.