How Do Online Slot Games Work?

online slot

Online slot games are becoming increasingly popular due to their convenience and ease of use. They work the same as traditional slots in that players make a wager and spin the reels to see if they have won. The symbols must land on a pay line to create a winning combination.

Random number generator

While some people believe that luck plays a role in online slots, it is actually a random number generator that determines the outcome of a spin. A random number is generated each millisecond and when a player presses “spin”, the game finds that random number.

This random number is then compared with mathematical algorithms to calculate the reels’ positions. This method of determining the symbols is used by many games and is tested by independent experts to ensure that it is fair. It is also used in board games and sports competitions. The technology behind this software is similar to that found in computers.


Online slot games work in a similar way to physical older slot machines, and use a random number generator that is audited regularly to ensure fairness. However, there are some misconceptions about rows and paylines in these machines. Rows must be strictly horizontal straight lines of paying symbols, whereas paylines can be either straight or any curved line.

To win an online slot, players need to land matching symbols on a payline in a particular order. The symbols must fit across the reels and match from left to right. The winning combinations of symbols can result in lucrative payouts. These combinations are determined by a computer program using an RNG (random number generator). This software ensures that every spin is random and fair.


Many slots feature symbols that match the game’s theme. These can include traditional lucky sevens, diamonds, bells and the so-called BAR symbol (which actually originated from a gum company logo). Some slots even have multiplier wilds that multiply your winnings!

The symbols used in online slot machines vary from one game to the next. The lowest valued ones are typically represented by card suits Hearst, Spades and Diamonds in modern slots, while older games use more traditional symbols like the number seven, a bell or a diamond. The more expensive symbols are usually centered on the slot’s theme. These may also trigger special features such as free spins, bonus rounds or respins.


A payline in an online slot machine is a line that crosses the reels and triggers a win when matching symbols land on it. Paylines can be horizontal, vertical or in a zig-zag pattern. They can also be fixed or adjustable. The more paylines you have, the higher your chances of winning.

Some slots use all-ways-win paylines, which means that you don’t need to hit a specific number of set paylines to win. These systems can have huge payouts. However, they may not always be the best for your bankroll. This is why it’s important to check the pay table before you play.

Bonus rounds

Bonus rounds in online slot games are a great way to boost wins and add excitement. They are generally triggered when a certain combination of symbols lands on the reels. Depending on the slot, these rounds can include mini-games, multipliers and free spins. They can also feature different special features like pick-and-win options and retriggerable bonuses.

Some slots even offer a unique game-within-a-game style bonus round. In this type of bonus game, players shoot down alien spaceships or go on a heist mission to steal jewels from a high-security museum. These bonus games typically require no skill on the player’s part, which makes them a great choice for new players.

Progressive jackpots

Online slot machines with progressive jackpots offer life-changing prizes. A portion of every wager is added to the jackpot, which rises until someone wins it. The jackpot then resets to a fixed amount.

The progressive prize is advertised prominently on the machine to lure players. It may also be displayed as a percentage of each bet, which can help you calculate your chances of winning the jackpot.

Tiered jackpots are common on progressive games, and some are shared across multiple casinos. These jackpots can reach millions of dollars, but the odds of winning are less than for stand-alone progressive jackpots.