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A great deal has been written about the honesty of land-based slot machines. A great article by Steve Bourie is titled, "Are Slot Machines Honest?" and originally appeared within the 1999 American Casino Guide. (It can be found online by searching for the title in Google or Yahoo!.) Physical, land-based slot machines have a great deal of "variations" (being polite) than can deceive the player. Simply, they can be all illegal and do not happen. But read the article, closely.
Alternatively, online casino slots use an electronic "random number generator" or RNG, operating inside a very large computer program that manages the game graphics, the player accounts of individuals who join the game, the statistics of every hand played, and also more. The random number generator is hard-coded software instructions that don't change. There isn't any "sense switch" (see the Bourie article) that may be flipped to give players worse odds. Regarding control parameters, each use of the RNG matches the final use, and can be the exact same as the next use. The numbers will come out randomly, but the pattern of randomness never changes. This is a true advantage of software-based online casino slots.
Land-based slot machines can also have payout percentages as little as 83%, which is just not true with online casino slots. In online gaming, each machine has the exact same winning percentage as the additional machines. You may see the payout percentages for many online gaming sites, and you shall see that it rarely drops below 95% - that's, the house makes a 5% profit, on the normal. In fact, most casinos can document that their payout percentages are within the 97% - 98% range. This means that you can spend an hour, gamble your $100 stake about 3 times, and on the normal it's going to cost you $7.50. But players do not gamble to be average: the true reward will be the well-paying win. As well as the well-paying win is balanced, remember, by a range of players who lose and finance that win.
So are fantastic online slot casino (try these guys) casino slots fair? Yes, they clearly are. The software that operates the games is tested regularly by independent testing laboratories (look for logos at the bottom of the casino website), and no game is individually controllable to be biased. That is a far cry from the situation with land-based slot machines, appropriately called "one-armed bandits".
Players improve odds, they get absolute consistency across all games - but no-one can guarantee a win every time. That is just the nature of gambling, and that is a part of the thrill.
So the next time you want to play a slot machine, even if there is a land-based casino right next door, you are better advised to go to your computer and play the online casino slots. They're a far better bet.