Roulette is a classic in the world of casino games. Along with blackjack and craps, roulette is a mainstay in any full service casino in the United States, and the game is even more popular in Europe, where it's a cultural and historical part of the gambling scene. In Europe people have been playing roulette since the 18th century and nowadays online roulette games are popular all over the world.Since at least 1796 when it was played in Paris roulette exists in the same form. Multiple games gave birth to roulette. To make a modern roulette game an Italian ball game called "biribi" and another wheel game that involved colors but not numbers were combined. In 1720 in England people began to play "Roly-poly" which consisted of black and white slots. Thus, roulette is a hybrid of both birib and Roly-poly.Understanding a game is the first step down the road of enjoying a game. And although knowledge of the game won't change your strategy or your chances of winning, it will increase the amount of pleasure you take away from the tables.

One subject that always comes up when people discuss winning at roulette or getting an edge is biased roulette wheels. To really find a bias in a wheel, you'd need to clock at least 4000 spins and realistically speaking, you won't find a bias towards red or black. At best you'll find a bias toward a specific set of numbers.
Casinos don't want a biased wheel, because the house edge at roulette relies on the odds being 37 to 1 for each number over time. If certain individual numbers pay out more often than they should, the casino loses money. In this respect, a biased wheel isn't like a fixed game of blackjack. Casinos don't really have an interest in fixing any of their games since the house edge is in their favor on all of them. If you are able to find a biased wheel, and you've got a reasonable amount of confidence in the bias, you should bet individual numbers as much as you can. If you're in a rare situation where you have an advantage over the casino, you don't want to waste it on bets with low payouts.
Something related to wheel bias dealer signature. Some roulette dealers have been spinning the ball for so long that they do it in exactly the same manner and at exactly the same speed every time. This produces a situation where some numbers might come up more often than other numbers.
Usually if you're looking for this type of advantage play it's best to find an older dealer who looks really bored. You don't want someone who's really young and just learning how to spin the wheel. You want someone who's spun it so many times that it's become automatic and predictable.
Since it would take about 4000 spins to determine with any degree of certainty any patterns on a roulette wheel, it would take a considerable amount of time to track that many spins. Realistically speaking, you might be better off learning to count cards or play poker really well instead of trying to get an advantage finding a biased wheel or a dealer with a signature.

In some casinos there exist some special rules.
In Prison/En prison
In case the ball stops at zero slot, the croupier will not collect red/black, odd/even and first half/last half bets, they will stay on the table - in other words they are in prison. The players can win their original bet back during the next spin;if their bet wins they get their original bets back without additional gain. If the ball should land on zero once again the bets will remain in prison one more spin and so on. As this special rule reduced the casinos edge, it's greatly to the advantage for the players.
La Partage
When the ball falls on zero, red/black, odd/even and first half/last half bets will not be fully collected by the croupier. The croupier will collect only a half of player's bets and will return the rest to the players. La Partage rule reduces the casinos edge to 1.35 percent as well as In Prison rule.

Can you imagine selling everything you own, jumping on a plane to Las Vegas, and risking all on a single red or black roulette spin! The very thought of it might probably fills you with equal measures of excitement and fear – the very same feelings experienced by 32 year-old Ashley Revell, from London, when he did the unthinkable! Having sold everything he had Revell came to one of the Las Vegas casinos with 2,000 with an intention to place all his money on Red. His family and some of his friends went to the casino with him and they were pleasantly surprised when the ball landed in Red number. Amazingly, seconds before placing all his cash on Red, Revell had planned on betting on black! Revell himself admits that it was a stupid thing to do – he just happened to get lucky – very lucky!