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I spent part of last week on vacation from science in Las Vegas, where I thankfully avoided financial ruin due to some fortunate combination of genes, math awareness and a wife that has no interest in gambling. Sure, I dabbled a bit in games of chance, but as soon as I got a little bit ahead on the blackjack tables I ran for my life, knowing that the probability would even out hard in the long run. For those concerned about the financial well-being of Sin City, they still managed to turn a profit on us, thanks to the low-return temptations of fine dining and French circus acts set to Beatles megamixes. But most of our time was spent on the free entertainment of people-watching and stuff-watching, observing row after row of people almost hypnotically at work on loud, noisy slot machines amid fake New York, Paris and Venice scenery.
Used Coin Slot Machines
It doesn’t take a PhD in neurobiology to conclude that slot machines are designed to lure people into a money-draining repetition, just as it doesn’t take expertise in the casino business to realize slots are absurdly profitable – there’s a reason why they outnumber table games 100-to-1. But I wanted to go back to the scientific literature to confirm a faint glimmer of information I retained from graduate school, specifically that slot machines are masterful manipulators of our brain’s natural reward system. Every feature – the incessant noise, the flashing lights, the position of the rolls and the sound of the coins hitting the dish – is designed to hijack the parts of our brain designed for the pursuit of food and sex and turn it into a river of quarters. Or so I remember.

Fortunately, there is a robust amount of research into why slot machines are so addictive, despite paying out only about 75% of what people put in. They are, some scientists have concluded, the most addictive of all the ways humans have designed to gamble, because pathological gambling appears faster in slots players and more money is spent on the machines than other forms of gambling. In Spain, where gambling is legal and slot machines can be found in most bars, more than 20.3 billion dollars was spent on slots in 2008 – 44% of the total money spent by Spaniards on gambling last year.
That data was published earlier this month by a psychologist from the Universidad de Valencia named Mariano Choliz in the Journal of Gambling Studies. Yes, such a publication exists! In the background of the paper, Choliz outlines the tricks that slot machines use to keep people feeding them:
- Operating on a random payout schedule, but appearing to be a variable payout; i.e. fooling the player into thinking that the more money they play, the more likely they are to win.
- “The illusion of control” in pressing buttons or pulling a lever to produce the outcome.
- The “near-miss” factor (more on this below)
- Increased arousal (where the sounds and flashing lights come in)
- Able to be played with very little money; the allure of “penny” slots.
- And perhaps most importantly, immediate gratification.
This last point is the subject of Choliz’s experiment, which puts a group of ten pathological gamblers in front of two different slot machines. One machine produces a result (win or lose) 2 seconds after the coin was virtually dropped (it was computer program), the other delayed the result until 10 seconds after the gambler hit play. In support of the immediate gratification theory, gamblers played almost twice as long on the 2-second machines than they did on the 10-second machines…even though the 10-second machines paid out more money on average!
Choliz concluded that the immediacy of the reward was part of what kept people at slot machines, making them so addictive. The quick turnaround between action and reward also allows people to get into a repetitious, uninterrupted behavior, which Choliz compares to the “Skinner boxes” of operant conditioning – the specialized cages where rats hit a lever for food or some other reward. It seems like a cruel comparison, but after my three days walking through the casinos, not an inaccurate one.
Another trick up the slot machine’s sleeve was profiled earlier this year by a group of scientists from the University of Cambridge. In the journal Neuron, Luke Clark and colleagues examined the “near-miss” effect, the observation that barely missing a big payout (i.e. two cherries on the payline while the third cherry is just off) is a powerful stimulator of gambling behavior.
The Cambridge researchers put their subjects in an fMRI machine to take images of their brains while they played a two-roll slot machine game. When the players hit a match and won money, the reward systems of the brain predictably got excited – the activation of areas classically associated to respond to food or sex I mentioned earlier. When players got a “near-miss,” they reported it as a negative experience, but also reported an increased desire to play! That feeling matched up with activation of two brain areas commonly associated with drug addiction: the ventral striatum and the insula (smokers who suffer insular damage suddenly lose the desire to smoke).
Clark and co. conclude that near-misses produce an “illusion of control” in gamblers, exploiting the credo of “practice makes perfect.” If you were learning a normal task such as hitting a baseball, a “near-miss” foul ball would suggest that you’re getting closer – it’s better than a complete whiff, after all. But for a slot machine, where pulling the lever has no impact on the rolls other than to start them moving and start the internal computer calculating, a “near-miss” is as meaningless as any miss.
Nevertheless, it’s this type of “cognitive distortion,” as Clark and colleagues name it, that makes slot machines such effective manipulators of our brains. Those massive, gaudy casino-hotels that I wore out a pair of shoes strolling through last week weren’t just built on a crafty use of probability, they were built on a exploitation of brain functions we are only just beginning to understand.
Of course gambling is not a good habbit but cheating is the worst! But in history, many people have figured out a good couple of ways how to cheat slots. Below you will find 10 of them. Be aware, none of these methods will work online gaming sites like Slots Heaven!
10 – Cheat Code
Ronald Dale Harris was a talented software engineer who was working for the Nevada Gaming Commission. His job was to programming computer chips for slot machines. Since he was the programmer, he did left a cheat code like a signature of him. The code was activated by a specific combination of coins something like ‘’5 coins, wait, 2 coin, wait, 6 coins, etc.’’ and the machine would automatically pay out. Brilliant!
09 – Light Wand
Golden Nugget
Back in the day, when slot machines started using the optical sensor technology, Tommy Glenn Carmichael invented a light wand that could blind these small, magical sensors. It was something like battery-powered mini light attached to a wire.
08 – Fake Coins
As simple as counterfeiting. Using advanced machinery, cheaters pressed counterfeit slot machine coins out of hardened metal dies.
07 – Software Glitch
Las Vegas
Sometimes the cheat comes with the slot machine built in. The most known slot machine with its glitch was ‘’The Game King’’. To exploit the glitch, the gambler would put more money into the machine after the “double up” prompt and then switch back to the original game they were playing for $1.00. Then player would then up their stakes to the highest allotted amount and cash out.
06 –Top-bottom Joint
The top-bottom joint was a trick created by Tommy Carmichael and Ray Ming. The duo created a slider, which was made of a guitar wire and a piece of spring steel. They would snake the payout chute using the top-bottom joint until tripping the switch. Once the switch was tripped, the slot machine would empty out its payload.
05 – Computer Chip Replacement

Computer Chips
Dennis Nikrasch bought a computerized slot machine and played with it in his garage till he found a method to manipulate the computer chip inside to give him a jackpot whenever he wanted. For this purpose, he ordered the standard chips from a real manufacturer. Then he team up to obtain keys on the black market that opened slot machines. After that he would be able to open the machine to replace the chip under three minutes!
04 – Shaved Coins
As slot machine technology advanced, machine manufacturers changed optic verification sensors to prevent scams. Improved mechanisms use a beam of light to register payment as the coin dropped in. Ironically, this innovation was used against itself to perform a cheat. Shaved coins are registered by the machine but once it gets to its comparitor new mechanism which is the piece of equipment that measures the size and weight of the coin, it will be immediately kicked out because of the coins minute size discrepancy. Of course then you can use it again…
03 – Piano Wire
Piano wires
Slot Machine With Coins
This method dates back to 1982. At the Caesars Boardwalk Regency in Atlantic City, a group of cheaters surrounded a slot machine. Each of them had a job. One of the cheaters dubbed the mechanic, pried open the front and inserted 20-inch piano wires into the slot machine’s whirring guts. The group used the piano wires to jam the clock that timed each wheel’s rotation. With the help of this method, he was able to manipulate and spin the wheels till he wins.02 – Monkey Paw
Coin Slot Machine For Sale
The monkey’s paw was one of the early devices used by slot cheats. The mechanism was essentially a guitar or piano string attached to a bent metal rod. Cheater would jam it into the machine through an air vent and fish around for the switch that released the coin hopper.
01 – YO-YO
Chips