It can be lit by the player by pressing the "service" or "help" button. They appeared on mechanical slot machines manufactured by Mills Novelty. On both systems, scatter symbols still pay in the darkened areas just like standard machines wherescatters don't have to appear on a payline. These enabled the player to stop each reel, allowing a degree of "skill" so as to satisfy the New Jersey gaming laws of the day which required that players were able to control the game in some way. Although the original slot machine used five reels, simpler, and therefore more reliable, three reel machines quickly became the standard. A slot machine does not afford such an opportunity. It is common that online casinos offer slightly higher odds and payback percentages than land-based casinos. Roulette In roulette, the players have to bet on either black or red, a single number, groups of numbers, even or odd, or high 1936 or low 118 numbers. A person playing a slot machine can insert cash, or in ticket-in, ticket-out machines, a paper ticket with a barcode, into a designated slot on the machine.