The mechanics of slot machines are quite complex and very few people understand how they work or are programmed to perform. Here is how three-reel 'stepper slots' that have actual moving reels really work.
The first step is for the player start a new play by pressing the spin or max bet button.
The machine then selects three random numbers, one for each reel. These are chosen from a random number generator which is constantly churning out random numbers at a rate of thousands per second. The numbers chosen at the moment the play has commenced are the ones used to determine the final outcome. In other words the outcome is already been fated the instant you press the spin button.
Next, the random numbers will pass through a mapping table to be assigned a specific reel to stop on. Each possible random number on each reel is mapped to a particular stop. Typically, the symbols with larger pay-outs are mapped to fewer numbers.
The machine will then spin for a few seconds to keep the players entertained and then stop on the reels programmed by the random numbers drawn on the reel map.
Five-reel video slots work in a similar fashion except that here, each reel stop has an equal weighting. This is because the game is multi-line and equal weighting results in equal odds for each line played.
Some slot machines have an in-built feature wherein the bonus increases in proportion to the amount a player plays. When the reels stop in a particular pattern the player wins the coins in the machine. These kinds of slots have variable states, which means, if the state is higher, so will the expected payback be, as well. Examples of this kind of machine include Piggy Bank, Car Race, Temperature Rising, and Double Diamond Mine. It is possible to have a positive expected value playing slots if you only play variable state slots in very high states.
Online casino players like playing Online Slots because it is the most realistic online game. The current software and technology allows the player to feel as if he or she is in a real life casino.
For more information follow slot gaming, Rules and Strategies.