What Makes Modern Online Slots Different From Classic Machines

A University of Nevada, Reno teaching deck on reading a slot machine's PAR sheet, by Ken Moberly, describes one IGT machine as having "22 physical symbols/stops" and "64 computer symbols/stops." The glass showed a reel with 22 positions. The software behind it was choosing from 64. Most of what separates a modern online slot from a classic cabinet follows from that gap.

The reel and the number

On a mechanical machine the odds were fixed by the strips themselves. Three reels with 22 stops each give 22 by 22 by 22 possible outcomes, which works out to 10,648, and every one of them was physically present on the strips. Once a computer chose the stop, the strip became a display: the same machine Moberly describes had 64 by 64 by 64, or 262,144, combinations, with the reel on the glass showing which one had been picked. Online slots take that arrangement and drop the glass. The generator selects the outcome and the reel animation renders it afterwards.

Most of the regulation attaches to the generator. GLI-19, the test-house standard that state regulators lean on for online play, requires that, given a sequence of past values from the generator, "it shall be computationally infeasible to predict or estimate future RNG values." Under that rule a game that has not paid out for an hour is in the same state it was in at the start of the hour, and the same standard is applied to the generator whether the theme is fruit or aliens.

The other change is location. A classic machine was a cabinet on a floor. An online slot is a program on a server run by the studio that made it, or by a supplier acting for it, and streamed into a casino's app. New Jersey's regulations have a section titled "Remote gaming systems" for exactly that arrangement, covering companies that "provide game content to another Internet gaming operator."

From one line to a grid

Paylines were a consequence of physical reels, and they went the same way. The classic machine paid on the center line, three symbols across. Digital games multiplied the lines, then dropped them. Play'n GO's Reactoonz, released in October 2017, is a seven-by-seven grid with no lines: you win "by collecting a cluster of five or more matching aliens," winning clusters vanish and the grid refills, and a bigger cluster pays more. Other engines pay on any matching run from the left regardless of row, and some change how many symbols each reel holds between spins, so the number of possible wins moves while you watch.

For a player the practical consequence is that two games can look alike in a listing and play nothing alike. Two apartments can photograph alike and live nothing alike, and anyone hunting this fall knows the feeling. A five-reel, twenty-line game and a seven-by-seven cluster grid are different products, whatever theme is painted on top.

Finding out before the first spin

Online casino play is not legal in New York. The bill that would authorize it, Senator Addabbo's S2614, was referred to the Senate's Racing, Gaming and Wagering Committee in January and has not left it, and it would in any case require the game servers to sit inside a licensed casino rather than in a studio's cloud. For a New Yorker, then, the way to find out how an engine plays is a demo; free versions of both formats are indexed on the FreeSpins platform, allowing players to test the mechanics before spinning for real.

The controls that came with the software

The last difference is one a cabinet never had. Because the game runs on an account, the account can carry rules. Where the product is legal, New Jersey's regulations use the account itself: a licensed system must stop wagering once a player's lifetime deposits pass $2,500, and may not resume until the player has acknowledged the total and been shown the limit-setting tools and the problem-gambling resources. In New York that resource is the HOPEline, 1-877-846-7369, or text HOPENY to 467369. A cabinet taking coins from whoever stood in front of it had no such rules to carry. A modern online slot is those two things, a tested number generator and an account the operator has to monitor, with the animation sitting on top of both.