Categories: Gambling

The Basics of Online Slot Machines

online slot

Online slot games are easy to play and a great way to pass the time. Many offer multiple pay lines and various ways to win. Some even have progressive jackpots that grow with every spin!

Online slots use software based random number generators to determine where symbols display on the reels. These are tested by independent software testing agencies to ensure that they are fair.


Reels are the symbols on which a slot machine spins each time you hit the spin button. If matching symbols land on a payline, they can trigger a payout or a bonus game. A common mistake is to confuse rows and paylines, but rows must be strictly straight lines while paylines can follow any curved pattern the developer chooses.

A popular misconception is that you can control the results of a spin by stopping the reels at the right moment. This is not true, as all modern slots use a PRNG system to determine the outcome of each spin. Nevertheless, some players still think they’re only a fraction of a second away from a big win. This can lead to a high amount of wasted spins.


Symbols are the building blocks of slot games, and they can make or break your winning combinations. The basic types of symbols include standard, wild and bonus symbols. Standard symbols are the most basic type of slot machine symbol. They are the workhorses of online slot machines and come in many forms, including cherries, bells, dollar signs, BARS and lucky sevens. These symbols are common to most online slots, and they typically correspond with the overall theme of a given game.

Scatter symbols are another type of slot symbol, and they pay out regardless of where they land on the reels. They can also trigger free spin rounds, and they often feature special multipliers or other special features. Likewise, bonus symbols are similar to scatters but trigger bonus games instead of free spins.


Paylines are an essential part of online slot machines, and understanding them can help you maximize your chances of winning. These lines form a pattern on the reels, and you will be paid whenever matching symbols land on one of these lines. While some slots have only a single payline, others can have multiple, offering more ways to win.

Generally, winning a payout on a payline requires three or more matching symbols in a row. However, some online slot games do not follow this standard and offer a different method of paying out. These are known as ‘ways to win’ and can include cluster pays, 243 ways, 1024 ways, and more. These methods are often explained in detail by the game’s paytable, so it is important to read it carefully before starting to play.

Bonus rounds

Some online slot games include bonus rounds, which are mini-games that give players a chance to collect additional payouts without taking anything from their bankroll. These features can range from simple mini-games like a card comparing game to more complex experiences like a free spins round or a jackpot upgrade.

Typically, players will trigger a bonus game when they land certain scatter or bonus symbols in the reels. However, some developers also let you buy your way into the feature by betting on it. These are known as Feature Buy slots.

These slots feature a special bonus game that can unlock a range of different experience, including extra wilds, free respins, colossal symbols, symbol transformations, and mystery symbols. These are some of the best ways to boost your chances of winning at an online slot!


RTP is a percentage that shows how often you can expect to win on a slot game. However, it is important to remember that RTP does not guarantee wins. Moreover, it does not take into account the volatility of a slot. Volatility measures how frequently a slot pays out and how big those wins are. High volatility slots pay out more frequently but with smaller winnings, while low volatility slots tend to have higher winnings but less frequent payouts.

The RTP of online slots can vary depending on the medium and the platform. It takes a specialized team to develop a premium slot, including a game designer, mathematician, server developer and between one and three front-end developers. This is an incredibly complex task, but it can be done.

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