How Online Slots Work

Online slot games have a lot to offer and can be very addictive. However, not all players understand how these machines work.

They rely on a random number generator to determine whether a player will win or lose. A certified RNG cannot be tampered with by the casino or its players.

Game mechanics

Online slots are complex games that use a variety of technology to create a fun and exciting experience for players. Unlike traditional slot machines, which are based on mechanical parts, these games use random number generators (RNG) to ensure that every spin is fair and that the player has the same chance of winning.

RNGs select random numbers every millisecond and link them to the outcome of a virtual spin. When a player presses “spin,” the RNG finds a random number and a mathematical module in the game software translates it to determine where the reels should stop.

The RNG system also allows players to adjust the coin size and number of coins per payline. This way, they can maximize their chances of winning without compromising their bankroll.

Bonus rounds

Usually, online slot game bonus rounds are triggered when players hit certain combinations of symbols. However, different games offer different types of bonus rounds, and it’s important to understand how they work before playing them. This way, you’ll be able to choose the right ones for your playing style.

Some bonus rounds involve a mini-game within the slot that opens up in its own separate window. Others simply add extra symbols on the reels. Some even have an additional bonus meter that accumulates as you play, leading to extra wins without any cost.

Most of these extra rounds are fun and exciting, but it’s easy to get caught up in them and lose control of your budget. To avoid this, set a win limit before you start playing and stick to it.


Reels are an integral part of online slot games. They are horizontal columns that feature symbols and determine the outcome of each spin. Unlike in the early days when there were limited and fixed symbols on each reel, today’s video slots use random number generators to regulate the outcome of each spin. This has revolutionised the gambling industry and opened up new opportunities for software providers.

While the basics of slots have remained the same since mechanical slot machines, some myths have emerged about how these wheels work. A common misconception is that a near-miss means that the player would have won if the reels had stopped just one position longer. This isn’t true, however, as the RNG system ensures that each spin is fair.


Depending on the game’s pay table, hitting specific combinations of symbols can result in payouts. These are determined by a random number generator (RNG) that emulates the outcome of a physical slot machine spin. Payouts for different symbol combinations vary between games, but most offer similar bonuses.

In modern online slots, low-paying symbols are typically represented by traditional card suits like Hearst, Clubs, Spades and Diamonds, while high-paying symbols correspond to the slot’s overall theme. In addition to these standard reel symbols, many online slots also include special symbols, such as scatters, Wilds and Multipliers. While Regular symbols must match some pattern (called pay-line) to yield a win, Special symbols usually trigger Bonus rounds or Free spins. However, there are some exceptions to this rule.


Paylines are the patterns on a slot’s reels that award players with winning combinations. They can be straight or zig-zag and can run diagonally or horizontally. To win a game, the matching symbols have to land on an active payline. The more paylines you activate, the more winning potential you have.

While some slots have fixed paylines that you cannot change, others allow you to adjust the number of active lines. This gives you more control over your bets and allows you to play with lower wagers. Additionally, you can try out games that use a ‘all-ways-win’ system, which means that winning combinations can land from either direction on the grid. This is a great way to practice your skills without risking money. Also, check out the payout table to see how much each payline pays.