Once a machine pays off, don't play it again because it won't pay off again for some time.
The machines have absolutely no ability to keep track of what has happened in the past. The results are totally random, the slot machine is as likely to pay off on the next pull as it would haveif a jackpot had not been won.Slot machines near the entrances to casinos pay off more than other machines.
This belief is based on the assumption that winning machines near the entrance will attract passerby's into the casino. However, today there is no need for casino operators to attract people toplay slots, so if it was true in the past it most likely doesn't apply to today's reality.Casinos can change the odds of a machine so beware of any casino employee fiddling around near the machines.
The payoffs on every slot machine are coded on a computer chip inserted into the machine when it's manufactured. Casinos, slot technicians, etc. cannot alter the payoffs.If a slot machine advertises a 95% payback then I should expect a return of $95 for every $100 I put into the machine.
The payback percentages are long term percentages. The long term outlook allows the casinos to average income from the machines over time, which is much longer than the time you wouldtake to play $100 in a machine. In the short term (the time you would take to play $100) the machine could pay off a lot more or a lot less than the advertised amount.You should play one coin at a time to get more chances at hitting the jackpot.
The chances of hitting a jackpot are small. In most cases, playing the maximum number of coins increases the payout rate percentage, which is actually your better bet to walking away as a winner.

Today the largest group of casino players are playing slots. It wasn't always this way, as late as the mid-seventies slots were not thought of serious games of chance. They were often played by the female companions of male table players, husbands were often seen giving their wives money to play the slots with while they went off to play the more serious table games. In those days a "respectable" table player wouldn't be caught playing the slots.The original slot machines were mechanical devices and some cheats tried various ways to beat the house. People tried everything from the use of magnets to drilling a hole through the side of the machines, all in an attempt to influence the mechanism. There was even a legal method discovered by a few that involved a style of pulling the handle that controlled the drop of one or more of the reels. This increased the players odds greatly, and caused the casino operators some concern until a method was devised to remove this advantage. The manufacturers have kept modifying and refining the machines to keep the games honest. Today the vast majority of slot machines are electronic and computer controlled so that outside manipulating of the machines by cheaters is now just a part of slot machine history.It was the introduction and rapid acceptance of video games that changed the slot machine forever, the casino operators developed a new line of electronic slot machines, ones that offered vivid graphics and exciting sound effects. The casino operators also added further refinements such as connecting several machines together and taking a small percentage of every play and adding it to a jackpot total. If no one hits the jackpot for some time it can grow into a huge amount, and although the odds are small it will payoff and one lucky player will win big. These "jackpots" also helped to increase slot popularity to where it is today.Today slots are the most popular form of casino gambling, with up to 40% of casino revenue originating from these "one armed bandits".