The result of each spin of the wheels is determined by a computer program that generates random results. This is true for both online slots games and slot machines found in hotel casinos. The machines can easily be set by the casino to generate whatever payout they choose. For example, they may set it to 95%. That means for every 100 dollars bet, the machine will, on average, pay out 95 dollars. The other five dollars goes to the casino and that's how they make their profit. Of course, that’s just on average. It’s possible, if Lady Luck is on your side, to make hundreds or even thousands of dollars with just one spin.

It’s a common myth that slot machines are the worst gamble in a casino. The truth is that making bad bets at the craps table or blackjack table can give far worse odds than any slot machine. In fact, the odds you get when playing slots are similar to those for roulette.

Another commonly held belief is that a slot machine that just gave a big payout won’t pay out again for a while. Actually, statistically speaking, the odds are the same for every spin and every spin is completely random and independent of all past spins. So there’s no way to predict the next spin and a jackpot is just as likely to be hit right after the last one was hit as it is after a thousand dry spins.

Most slot machines reward you for playing the maximum number of coins. For example the jackpot may pay 2000 coins with 2 coins played, but 4000 coins when 3 coins are played. If you don't feel comfortable playing the maximum coins you might consider moving down to a machine that accepts lower-value coins so you can play the maximum. For example instead of playing one coin at a dollar machine, play the maximum number of coins at a quarter machine. Some online casinos let you play for nickels. I've even played online slots on penny machines (at Kenny Rogers Casino).

Play at casinos that advertise the best payback percentages. These casinos are eager for your business are willing to reward you with better payouts.

If you’re playing a progressive machine, remember that you'll probably have to bet the maximum number of coins to be eligible to win the big jackpot.