How are Slots & Other Online Casino Games Programmed?

Right now, the online casino and gambling industry is booming. More players are discovering how much fun online casinos are, and more companies realize how profitable they can be.

With so much choice in the marketplace, there is always fear that some casinos could rig games. After all, online casino games are programmed using complex software that indeed can be rigged.

Sure, there will always be some shady businesses in all industries looking to rip people off, but the vast majority of online casinos use legitimate software that is not rigged.

To protect yourself from scams, you should always use reputable websites like those included on this list of top 100 online casinos.

It is also worth knowing how online casino games use their software and why they don’t need to rig their games, which is exactly what this article will cover.

How do Casinos Programme their Games?

Every online casino game is programmed using what is known as a “random number generator” software. The software used will be different for each game and can become highly complex for some slot games with multiple pay lines, multipliers, and progressive jackpots.

However, the software result is always the same: to ensure the results of every spin or hand are random. The software works in the background with computer programs to produce a constant sequence of random numbers that have no pattern.

The random number generator communicates with the software to deliver the outcomes of your casino games.

As a result, the outcomes have no discernible pattern and are just as random as they would be inside a physical casino.

Who Provides the Software?

Many casino providers would use their own proprietary software on their websites in the early days of online gambling. Of course, this didn’t help people’s fears that the casinos could be rigging their games.

Nowadays, the far more common practice is to use third-party game software that has been developed by companies that specialize in online casino software.

Several reputable online casino software providers produce games that are used in different casinos across the internet:


Microgaming has been around since the very beginning of online gambling and opened their first online casino in 1994 (although some dispute this claim). What can’t be disputed is the quality of the games they have been producing over the years.

The company has won numerous prestigious awards, and its games are found in top casinos like Bet365, William Hill, and Jackwin (review here:

Net Entertainment

This Swedish software company was established back in 1996 and was set up by one of the biggest land-based casino operators in Scandinavia. NetEnt, as it is widely known, has become popular with players for producing high-quality games with impressive graphics and sounds.

One of the company’s most famous games is their slot machine “Starburst,” which has become one of the most well-known slot games available.

888, Betfair, and Paddy Power are among the well-known casinos that use software provided by NetEnt. They can also be used on mobile devices.


Playtech’s software is used by a vast number of the top names in the online casino world. The company produces games across a variety of categories, including slots and table games. Playtech is known for developing immersive themed slot games like Rocky and X-men.

Online casinos using Playtech software include many top UK gambling providers like Coral, Ladbrokes, and Bet365.

Casino Software Regulation

To make sure online casino software has not been rigged and plays fairly, independent regulators carry out regular checks on both the software provider and the casino itself.

This double-verification process enhances the safety of customers because you can check the software provider’s certificates as well as the casino’s certificates.

One of the most reputable testing agencies is eCOGRA. If a software provider and casino have valid certificates from eCOGRA, you can be sure their games are legitimate and not rigged.

Why Casino Games Don’t Need to be Rigged

For a casino to be profitable, every one of their games incorporates a “house edge,” which tips the balance slightly in favor of the casino. The house edge is a well-known concept and is clearly-stated by the casino on individual games.

The house edge is mathematically calculated to ensure the casino never pays out more than they bring in over the long-term. By long-term, I mean thousands of hands or even millions of spins.

For example, a slot machine can be programmed to payout 96% of the money it makes, known as a 96% RTP (return to player). You should keep in mind the RTP is just an average statistical calculation. Since the random number generator operates the games, the chance of winning from each spin remains the same.

This average return calculation is made over the course of millions of spins, so it doesn’t mean you are guaranteed only to receive $96 if you put in $100.

In the above example, the remainder of the money is the house edge, so they have an edge of 4% for that particular game.

The house edge is incorporated into every game to ensure the casino turns a profit, which means they have no reason to rig their games and risk severe consequences.

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