1. How Do Slot Machines Work

Modern slot machines use a computer program to determine the outcomes. The spinning reels are just for show, even on machines that LOOK like they’re using physical reels. But many – if not most – modern slot machines just use a computer monitor with animated reels to determine outcomes. Modern slot machines and online slots use a different number of symbols on the reels. This influences the number of possible combinations that can occur during the game and thus affects the slots odds. Here are several examples of 3-reel and 5-reel slots with different number of symbols on the reels.

This is what is known about casino slot machines:

The RNG (Random Number Generator)

The Random Number Generator (RNG) is the brains of the slot machine. While most player 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. – This is completely false and heres why. 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 known as the RNG. This generates numbers to correspond to the symbols on the reel of the slot machine and decides the outcome of the game cycle. 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 with the 1st hit of the spin button or 1st deposit of 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 and varified 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. While all of this may sound reasonable it still does not give the normal person any basic understanding about how the RNG works. I would like to try to explain it in a simplified manner that I think most of us can 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 and how little affect the payout percentage chip installed in a slot machine actually has. Reel type slot machines have a number of spaces and stops on each reel that contain either a symbol or blank. These are refereed 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 micro processing technology allows the newer machines to be able to accommodate a large number of “Virtual stops”. I will try to simplify things by saying this: 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 flips. This is similiar to a 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
• There are 963 losing combinations consists 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.

All this comes down to this:

The percentage chip payout is based over the life of the machine. The expected service of any Commercial slot machine is at least 40 million game cycles. It might pay back 500% today and 10% tomorrow. It could also pay 180% for a month straight and then 2% for a year. The average will equal the percentage chip installed in the main board. This is why when you are at a casino you can dump $1000 or more in a slot machine, take a 5 minute walk to the restroom and when you return to the machine you were playing you see someone else sitting there with a smile from ear to ear because they just won a jackpot that should belong to you, after all the money thats in the machine was yours, wasn’t it?

Slot Terms and what they mean

• PAR = Paytable and Reelstrip listing though it is widely refered to as the pay out percentage.
• HFRQ = Hit Frequency.
• PSR = A program summary report

From what I have learned, there are two factors that are figured into a slot machine to eventually come up with the PAR. One of those is the hit frequency and the other is the win frequency. They are mutually exclusive, Example: – If you have a high hit frequency, you will have a low win frequency, and if you have a high win frequency, you will have a low hit frequency. Hit frequency is how often the machine actually pays something, and win frequnecy is how often a big jackpot is paid. All of this shapes how volatile the machine is. The way I understand it is you can’t change those factors and not mess with the PAR, and that is part of what GLI checks with the math.

If you know what you are looking for, you can actually observe it during machine play. Compare the play on a Double Red White and Blue with a Triple Red White and Blue. While the theme sounds the same, the volatility of the machines are worlds apart. You should see lots of small payouts on the double RWB and few jackpots,and the opposite on the Triple RWB.

Hit frequency depends on how many of the possible combinations result in a win. If there are 262,144 possible combinations (a three reel, 64 positions per reel game). We may have, say 61,700 possible winning combinations (taken from a real game). For the example given, on the average about 23% of the games will result in a win of some kind.

The hold of the game may be altered by either changing the number of winning combinations, or changing how much gets paid on a certain win. The first can be done without a change in the Pay Table. The second will reflect as a change in the pay Table.

All reel games I have ever seen have many possible combinations to give a different Hold. The intention is that a different denomination for a given game be set to a given Hold. A casino can choose to have 2.5% of a dollar, or 10% of a quarter, and so on, each giving the casino about the same revenue per coin played.

Hit frequency varies more according to different games than within a given game. A higher hit frequency makes a game more exciting The pay awards are usually lower, but coming more often. A lower hit frequency game usually has higher payouts, but is hit less often. Both games can have the same Hold.

Hit frequency depends on how many of the possible combinations result in a win. If there are 262,144 possible combinations (a three reel, 64 positions per reel game). We may have, say 61,700 possible winning combinations (taken from a real game)”

So I gather that “positions” mean symbols on the reel and Is that a typical amount of combinations? (64 ^3)

My Experience with hands on debugging of many micoporcessors and some limited programming. It seems to me with todays video processing power it could be a huge number of positions and combinations. ( I mean the reels don’t actually spin any more, its more just scrolling video data. The same goes for the RNG (Random Number Generator). To put it in layman terms, how many positions/possible combinations would a “money to burn”, “winning bid”, “jackpot party”, etc have?

Well, Generally there are aproximately 32 positions per reel. (Ok 5 reels = a really big number.

High jackpot value = really low hit rate on the Jackpot, but lots of small wins.

Most of the hardware is pretty standard microprocessor circuits with only a few bells and whistles added. De-engineering is seldom difficult if you have done it before. Dis-assembling firmware is time consuming but an excellent learning experience. You really get a good understanding of how the game works.

Most Stepper (reel) games have only 22 reel stops including the blanks. However, virtual numbers are assigned to the reel stops. which means that the reels can be weighted. As an example assign more virtual numbers to the blank spaces on a slot machine reel. (usually blank spaces around the symbols for the top award) This of course intices players to stay at a machine for longer periods. Im not totally sure but with the memory limitations on IGT S+ machines highest number of virtual reel stops is 64^3 however on video reel machines appear to have as many as 88 reel stops (no virtual stops for video since they are virtual reels) now the strange thing is that they can have more reel stops for some reels than others. eg:

A game with 5 reels can have 60 stops for the 5th reel 70 for the 4th 72 for the 2nd and 3rd and 88 for the 1st this would yeild 1,916,006,400 reel combos. thats a whole lot to work with. you could imagine the possibilities in tweaking either the PAR or HFRQ by fractions of a %. – All This is just my opinion, of course!

Slot game is very easy to master if the player is familiar with all the options of slot machines and knows which buttons are used to choose the betting amount, the paylines, make bets or activate the slots reels. No matter what type of the game you play and how much you are going to spend during the play (your bankroll) the procedure of a slot game is always the same. If you visit a real casino and are not sure about the game rules or payouts, feel free to ask the casino employee how to play slots. However, if you play slots online, you can learn the complete rules of slot machines at SlotsDoc.com.

Slots Rules

Before starting to play and risking money you must decide on your bankroll which is the amount of gambling dollars you are ready and can afford to wager or lose on playing the slot games. The second and very important step is to select the “appropriate” slot machine with a high payback percentage and a coin denomination that suits your overall bankroll. This is crucial if you don’t want to lose all you have in a moment and wish to “stretch” your cash. Today casinos offer many themed slots of different types and that is why you can select a game that is really pleasant to play, with great images, animation and sounds. After you decide on a slot machine, then it is time to play. These are the basic rules of playing real casino slot machines (installed in land gambling halls) and online slots:

Casino Slots

1. Buy special slot coins, chips, tickets or use slots club card.
2. Choose an “appropriate” slot machine.
3. Insert a coin into the slot machine coin receiver.
4. Choose the coin denomination by pushing special +/- Coin buttons if you are playing a multi-denomination slot machine.
5. Select the number of coins you wish to play. Use Bet the One Credit or Bet Max Credits buttons.
6. When you play multi-reel video slots select the number of paylines to bet on.
7. Pull the lever or push the Spin Reels button to set the reels spinning.
8. After the reels stop Cash Out to get the winning.

Online Slots

1. Download the casino software.
2. Sign up to create a casino account.
3. Make a real money deposit.
4. Select the online slot game you wish to play.
5. Choose the coin denomination by clicking on the special +/- buttons.
6. Select the number of paylines by activating special Payline indicators or clicking the Lines +/- buttons.
7. Choose the number of coins if possible.
8. Click Spin or Bet Max to activate slot games.
9. After the reels stop spinning check the Paytable.
10. The winnings are automatically added to your money balance.

NB: The names of the buttons and options found on the slot machine can vary. You can learn about the most common buttons, options and features in detail by visiting our slot machine basics page.

Slot Machine Technology

The main feature of slot games which distinguishes slots from other casino games is, of course, the spinning reels. Vegas tower slots free coins. The reels on slot machines stop on their own or by a player pushing the Stop button (this is the so-called skill stop option), the period of spins and the time of stop are influenced by the RNG which generates random numbers determining the game results. When the reels stop, the symbols on the lines player bet on are compared to the winning payline patterns in the game paytable. If there is a match then the win is calculated and paid out. The amount of the win is the value of a bet per line multiplied by the winning amount in the paytable.

Modern slot machines and online slots use a different number of symbols on the reels. This influences the number of possible combinations that can occur during the game and thus affects the slots odds. Here are several examples of 3-reel and 5-reel slots with different number of symbols on the reels. You can see how the number of possible combinations in the game depends on the number of symbols on each reel.

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However, modern technologies have allowed to increase the player odds by offering a great variety of bonuses, special substitute symbols and paylines which substantially influence the game results. Today a player can try 3-reel classic slots with up to 5 paylines and 5-reel video slots with the number of paylines from 1 to 100! Casino comps can be also counted as a great benefit and an additional chance to save up money for playing and to decrease losses.

Slot machines usually offer different coin denominations from $.01 to $100.00. These are multi-denomination slot machines which allow the player to choose the coin denomination they want to play rather than always bet the set amount. Multi-denomination slots have an extra +/- button which when pushed allows the player to increase or decrease the coin denomination. These machi¬nes automatically calculate the number of credits to pay out in exchange for cash. Large slot machines which offer bets of $5, $10 or more on one line are often for high-rollers and are usually placed in special casino areas.

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Slots Paylines

Slots payline can be defined as a line (straight or zigzagged) that crosses one symbol on each reel and is what the players bet on; or a combination of symbols on the slot machine reels for getting which the player is paid out if he has made a bet on that combination. Paylines are usually depicted as standard patterns in the paytable. Let’s consider an example of the payline patterns on the free slot machine game available at SlotsDoc.com. This is a 5-reel video slot game with 25 paylines which means that the player can bet on 1 to 25 paylines and get paid out for any of the 1-25 combinations that occur on the reels.

NB: For any combination to win, the reels MUST have at least two identical symbols one after another, and the first one MUST occur on the first reel. Otherwise the combination doesn’t pay out.

For a better understanding of the slots paylines let’s consider the examples of winning combinations on the reels and the payline patterns from the paytable they correspond to.

Payline Patterns

There are 25 standard paylines used in most 5-reel slot games. As you see, slot paylines can be lines of different directions: straight, zigzagged, diagonal, vertical or horizontal. To be easily distinguished each payline is marked with a definite color.

The examples below show what the paylines look like on the reels. Moreover, all the combinations you see on the slot game reels are winning ones as they contain sequences of at least 2 matching symbols starting from the first reel.

How Do Slot Machines Work

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