For example a higher paying machine may have more of the higher paying symbols. The distribution of each symbol on each reel is what determines the theoretical return of the machine. On video display slots the stops are not weighted in other words all stops are equally likely. On atypical game there might be about 8 different possible return percentages, ranging from about 85% to 98%.Įach of the different par sheets has five sets of distinct reels. The EPROM (Erasable Programmable Read Only Memory) chip is what tells the machine the order of the symbols on the reel, in some cases how the stops are weighted, how much each winning combination pays, and any other pertinent information about how much the machine pays.It is up to the slot manager to select which EPROM chip to order according to the return percentage desired. MethodologyĪ kind and anonymous source provided me with par sheets for the games in question. However some casinos did mix up loose and tight machines, most notably Treasure Island and the California casinos. Most casinos were very consistent in their slot returns.If one nickel machine had a return of x% then all others like it also returned x%. There was also no correlation between return and proximity to such things as the main door, table game pit, high traffic areas, and low traffic areas. Machines on the end of a bank did no better on average than those in the middle. There seemed to be no truth behind slot placement myths. They left off LeopardSpots, and the study began in October. The small print at thebottom says, 'Independent study conducted between November2001-February 2002 on Austin Powers, Fortune Cookie, Reel'em In, and Wheel of Fortune games. Actually the study only says that the Palms had the lowest nickel video slotsof the casinos surveyed in Las Vegas. The'.' in the sign encompases quite a bit of information,which was conveniently left off the sign. Although I did the study Anthony Curtis published it in the LasVegas Advisor, which is how it become well known. The above sign can be found across the street from the Palms. The next table shows the average return by location. I can not include any casino that prohibits the method in which I gather data. The Suncoast and Rampart Casino in Summerlin do not allow playing slots and taking notes at the same time.

Must-Hit-By Progressives on Ainsworth Slots.Shopping Spree Jackpot at $4 Million Does it Have a Positive Expected Value?.Deconstructing the Atkins Diet Slot Machine.3d: Slot Machine Return Percentages for Henderson/Lake Mead Casinos.3c: Slot Machine returns in Tunica, MS (Mississippi).3b: Slot Machine Return Percentages in Jean & Primm, Nevada.2: How to Calculate the Return for a Slot Machine.

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