Random Number Slot Machine

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RNGs are also used to determine the outcomes of all modern slot machines. Finally, random numbers are also useful in statistics and simulations, where they might be generated from distributions different than the uniform, e.g. A normal distribution, a binomial distribution, a power distribution, pareto distribution.

The Random Number Generator (RNG) is the brains of the slot machine. While most players know that there is a computer chip picking the numbers, they do not fully understand how it works and this can lead to some of the many myths and misconceptions about a slot machine. One of the most common myths is that a machine has a cycle that can let a player know when it is due to hit. Many “Snake Oil Salesmen” will try to sell you a system for doing just that. Save your money — it can’t be done.

  • I used to work for a pretty big slot machine development company as a game developer. To make it easier to understand, the slot games are purely based on RNG - random number generator.
  • Random Number Generators (RNG) are behind slot machines and other online casino games. The RNGs are what makes it so hard to win at online casinos. No matter how many times you play, your odds remain exactly the same. The biggest thing to remember with.

The RNG Program

Inside the slot machine is a microprocessor similar to the one in your home computer. Instead of running Word or Excel, it runs a special program, the RNG, that generates numbers to correspond to the symbols on the reel of the slot machine.

You might say that the RNG is in perpetual motion. As long as there is power to the machine it is constantly selecting random numbers every millisecond. The RNG generates a value between 0 and 4 billion (approx number) which is then translated into a specific set of numbers to correspond to the symbols on the reels. The outcome of each spin is determined by the number selected by the RNG. This number is chosen when you hit the spin button or deposit a coin.

The RNG uses a formula known as an algorithm which is a series of instructions for generating the numbers. The scope of this is beyond most of our mathematical knowledge but can be checked for accuracy. This is done by the Casino Control Board and other testing laboratories to make sure that the program performs as it should so the player will not be cheated.

Principles of the Random Number Generator

Here is a more simplified explanation that's easier to relate to. Although this is not precisely how the RNG operates, it should give you a basic understanding of the principles of how the winning spins are determined.

Reel Type Slot Machines

Reel type slot machines have a number of spaces on each reel that contain a symbol or blank. These are referred to as the physical stops. Most of the old mechanical machines had reels that could hold 20 symbols while the modern slots have reels with 22 physical stops. The ​microprocessing technology allows the new machines to be able to accommodate a large number of “Virtual stops” which I will explain in a future article.

For this example, let’s simplify things and imagine that there are only 10 stops on each reel. With 10 stops there can be 1,000 different combinations. We get this number by multiplying the number of symbols on each reel. (10 x 10 x 10 = 1,000) The 1,000 combinations that can be attained are known as a cycle, and this is the word that sometimes confuses a player into thinking that the machine has cycles of winning and losing.

The odds of a three number combination being picked are one in a thousand. Theoretically, if you play 1,000 spins you should see each of these number combinations once. However, we all know that this is not the case. If you played a million spins you would see that the numbers would even out to be closer to the actual probability. This is similar to flipping a coin 100 times. Although the odds are 50 -50 you are unlikely to see 50 heads and 50 tails after 100 spins.

The Daily Pick 3 Lottery

Many of you have seen the Daily Pick 3 lottery drawing. They have three glass bowls or drums each containing ten balls numbered 0 -9. The balls are mixed up and when the top is lifted a ball pops up the tube showing you the first number. This is repeated for the second and third number to give you a three-digit winning combination.

To use this as an example of the operation of the slot machine, we will replace the numbers 0-9 on the balls with slot symbols. In each bowl, we will have one ball with the jackpot symbol on it. Two balls with a Bar, three balls with a cherry and four balls which are blank. Imagine the RNG in the slot machine as the person drawing the winning combination.

Here is the breakdown of the number of times out of a thousand that the winning combination made.

  • 3 Jackpot 1 (1x1x1)
  • 3 Bars 8 (2x2x2)
  • 3 Cherries 27 (3x3x3)
  • Total Wins 37

Slot Machine Random Name Generator

The 963 losing combinations consist of:

  • 3 blanks
  • 2 blanks and a symbol
  • 1 blank and two different symbols
  • 3 mixed symbols

The RNG picks these combinations of numbers thousands of times each second. Now imagine a string of blinking lights where only one bulb can be lit at a time. The electrical current is zipping from bulb to bulb down the string. When you push a button the current stops moving and the bulb in that position lights up. In this example, the light represents the three digit number just picked by the RNG. If you hesitated a second before pushing the button the results would be different. This is the same as you getting up from a machine and seeing someone else sit down and hit the jackpot. The chances are astronomical that you would have hit the spin button at the exact same millisecond.

Readers ask if quick reflexes are the key to winning

By John Grochowski

I keep a list of questions that I’m most often asked about slot machines. You could probably tick off some of them: “Are games programmed to go cold after a big win?” “Do you get less payback when you use your rewards card?” And the big one, “Can you tell me how to win?”

Those have been standards ever since I started writing about casinos and casino games 20 years ago. But recently, another question has been shooting up the charts. I have it all the way up at No. 2 on the readers’ hit parade:

“I’ve noticed on a lot of video slot games that if I hit the button a second time while the reels are spinning, they stop right away. I was wondering if I could use this to my advantage. If I see the bonus triggers or the jackpot symbols at the top, should I quickly hit the button again and try to stop the reels?”

I had that thought myself the first time I accidentally double-hit a button and saw the reels click to an immediate halt. Could this be an answer to the chart-topping question, “how to win on the slots?”

Random Number Generator Slot Machine

Unfortunately, it doesn’t work that way. In nearly all slot games that allow you to stop the reels, there is no skill or timing involved on your part. The random number generator has already determined your outcome when you hit the button to spin the reels, and you’re going to get the same result regardless of whether you stop the reels early, or let them halt in their own time.

When you play a slot machine, the game isn’t actually being played out on the reels, whether it uses “real” reels or video reels. It’s being played internally, on the game’s random number generator. The reels are just a player-friendly interface, and are told where to stop by the RNG. If there’s a malfunction and the reel display doesn’t match the numbers generated, it’s the RNG that counts. Large jackpots can be denied—and have been denied—if a check shows the random numbers on the internal computer chip don’t match the winning symbols on the reels.

Slot

But this is extremely rare. The engineering is good enough that almost all the time, the RNG and reel display are going to match up. This doesn’t change if you double-hit the bet button. If the RNG has spit out a random number that tells the first reel to stop on a single bar, then you’re going to get a single bar—regardless of whether you hit the button a second time for a “quick stop,” or just let them take their own sweet time.

There are rare exceptions. When I’ve answered similar questions in the past, I’ve mentioned IGT’s Reel Edge games. In their original incarnation, Reel Edge games enabled players to touch and stop the reels one at a time. There was actual skill involved. Your timing in stopping the reels determined the outcome. The reels spun very, very fast, so it was going take a keen eye and sharp reflexes to get better than random results, but it was possible.

I gave it a try, and found my reflexes just weren’t fast enough to generate more than my normal share of winners. In the original three-reel Blood Life game, I identified a green 7 as the easiest symbol to pick out as it whizzed by. I touched each reel individually as I saw a green 7 reach the top of the slot window, and managed to stop 7s on all three reels. Alas, I failed to land them all on the same payline. Some younger folks with quicker reactions may have been able to do better.

I don’t know if any of the first generation of Reel Edge games remain on casino floors. They were never widespread, and I don’t get lists from casinos or manufacturers telling me what games are available in any given casino. The new generation of Reel Edge puts the skill-based portions of the games in the bonus events.

Blood Life’s updated video incarnation, Blood Life Legends, allows you to test your skill with a joystick to guide a bat through the ups, downs, twists and turns of a cave as you try to collect gems for bonuses. There is actual skill involved, but it’s not the reel-stopping experience readers have been asking about.

On most slot games, even in the bonus events you’re getting an illusion of skill rather than actual skill. And when it comes to stopping the reels, it’s the random number generator, not your reflexes, that determines the results.

What about my readers’ other top questions?

To answer another—no, games are not programmed to go cold after big wins. Results remain as random as humans can program a computer to be. As long as the RNG keeps doing its thing, any big jackpot, any hot streak, and any cold streak eventually fade away into statistical insignificance, and the machine comes very close to its expected payback percentage.

No, you don’t get less payback when you use your rewards card. The player rewards system doesn’t interact with the RNG.

And no, with rare exceptions, there is no way to beat the slots except by being in the right place at the right time. There have been opportunities for small profit on games with banked bonuses such as the old WMS game Piggy Bankin’, where the sharpies would start to play only when there were enough coins in the bank to give the player an edge.

Slot Machine Random Number Generator

Such games are not common. Just as with stopping the reels early, your results are up to chance and the RNG.