Slot Machine Effect Final Cut

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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?”

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.

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.

Slot Machine is a simulation of a slot machine with three wheels. Player starts with 20 tokens and can wager 1, 5 or 10 tokens per pull. Payout is approximately 85% (similar to Las Vegas). Slot machine software download.

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.

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

I was bored and that can be a dangerous thing. Like doodling on the phone book while you are talking on the phone, I doodle code while answering questions on DIC. Yeah, it means I have no life and yes it means I was born a coder. During this little doodle I decided to make a slot machine. But not your standard slot machine per say, but one designed a little bit more like the real thing. Sure it could have been done a little more simpler and not even using a Wheel class at all, but what fun is that? In this entry I show the creation of a slot machine from a bit more of a mechanical aspect than a purely computerized one. It should provide a small sampling of classes and how they can represent real life machines. We cover it all right here on the Programming Underground!

So as I have already said, this little project was just something to play around with. It turned out kinda nice, so I thought I would share it. But what did I mean about it being mechanical in nature? Well, if you have ever played a real slot machine, not the digital ones they have in casinos now, you would see a metal case with a series of wheels. Typically it would be three wheels with pictures on them. When you put your money in and pull the handle the wheels would be set into motion. They would spin and then the first wheel would stop, followed by the second and then the third. After they have all stopped, the winnings are determined and you are paid out in coinage or credits.

I thought, why not be a bit mechanical in this slot machine design and create the wheels as a class called “Wheel” and give it the ability to spin independently of the other wheels? Have the wheel keep track of which picture (or in our case number) is flying by and report the results to the actual slot machine class. I could have done this mechanism without the need of a wheel at all and instead load up an array and have it randomly pick a number from the wheel. Little slimmer, little more efficient but wouldn’t show much programming theory.

What do we gain by recreating these Wheel classes and spinning them independently? Well, you gain a slight bit of flexibility. Independently we are able to control the speed of the spinning if we wanted to, we are able to grasp the idea of the wheel as a concept in our mind and manipulate it. We could easily built in features like if the wheel lands on a certain number it will adjust itself. Like some slots in Vegas, if you land on lets say a rocket in the center line, the machine would see the rocket and correct the wheel to spin backwards 1 spot (in the direction of the rocket as if the rocket was controlling the wheel). We could spin one wheel one way and another wheel another. We could inherit from that wheel and create a specialized wheel that does a slew of new different behaviors. All encapsulated into one solid object making the actual Machine class oblivious to the trickery of the wheel itself… encapsulation at its finest!

The machine class we create will contain 3 pointers. Each to one of the wheels. The machine itself will be in charge of a few different tasks. Taking money, issuing and removing credits, determining when to spin, telling each of the wheels to spin and checking our winnings based on some chart we create. It has enough on its plate than worrying about the wheels and reading their values.

So lets start with our Wheel class and its declaration/implementation…

wheel.h

As you can see the wheel itself is not a difficult concept to envision. The bulk of the work is in the read() method. Here we simply read the values from our internal array of integers (the values on the wheel) and return those values as an array of the three integers… representing the visible column. This column will then be loaded into our 2-Dimensional Array back in the Machine class. The 2D array represents the view or screen by which the user sees the results. Remember that the user never gets to see the entire wheel. Only the 3 consecutive values on the face of the wheel.

Here is how it may look in the real world. We have our machine with the three wheels and our 2D array called “Screen” which acts as our viewing window. Each wheel will report its values and those values will be put into the screen…

Below is our machine class…

Slot Machine Effect Final Cutter

machine.h

Slot Machine Effect Final Cutting Tool

This looks like a lot of code but really it is not if you look at each function. Most of them are very very simple to understand. We have a spin method which essentially spins each of the wheels, reads their values back from the Wheel class into a pointer (representing each column), then they are loaded into the 2D array one column at a time (our view screen), printed for the user to see the results and lastly the winnings are checked. The checkwinnings() method determines which rows to check based on the amount of the bet. If they chose 1 line, it checks for winning combinations on the middle row only. If they choose 2 lines, it checks the middle and top lines, 3 line bet checks all three horizontal rows, 4 line bet checks the first diagonal as well and 5 line bet checks both diagonals in addition to the lines.

How does it check the lines? Well each line is given to the checkline() helper function which compares the 3 values of the line against an enumerated type of various symbols. Here we are just assigning a symbol against each numbered value to help the programmer determine which numbers correspond to which winning combos. For instance, luckyseven represents the number 3 in the enumeration. So if it runs across a line with 3 number 3s, then it knows it hit the grand jackpot and credits the player 1000. This method makes things easy because if we ever wanted to change the win patterns later, we could change the enum and checkline method to do so. We could also build in multiple types of symbols and even let the user choose what slot machine game they want to go by. It becomes very flexible and is a testament to great design!

Slot Machine Effect Final Cut Off

Lastly we can put some tests together just to show some the various aspects of how this thing works and how the programmer can use the classes…

slotmachine.cpp

This simply inserts a 5 dollar bill and a coin for good luck. Then bets 5 lines and spins. Despite the outcome we go and bet five lines again and spin once more. Hopefully we win something this time around! But either way, those are the classes for you and I hope you like them. As always, all code here on the Programming Underground is in the public domain and free for the taking (just don’t cause a mess in isle 3, I am tired of running out there for cleanup). Thanks for stopping by and reading my blog. 🙂