Slot machines include a currency detector that validates the money inserted to play. All reels must be accompanied by buttons which allow players to manually stop them, reels may not spin faster than 80 RPM, and reels must stop within.19seconds of a button press. Bonuses vary depending upon the game. If there is the ability to re-trigger free spins during the free spin bonus there is no theoretical limit to the number of free spins obtainable. There are many different kinds of gambling slot machines in places such as Las Vegas (as well as casinos modeled after those in Las Vegas, including those operated on Native American reservations). It is programmed to occur an average of once every 219 plays. Each slot machine in the group contributes a small amount to this progressive jackpot, awarded to a player who gets, for example, a royal flush on a video poker machine or a specific combination of symbols on a regular or nine-line slot machine. While the machine is in bonus mode, the player is entertained with special winning scenes on the LCD display, and energizing music is heard, payout after payout. "hall OF fame IN slot games : Casino Player Magazine - Strictly Slots Magazine - Casino Gambling Tips". It can be calculated that over a sufficiently long period, such as 1,000,000 spins, that the machine will return an average of 950,000 to its players, who have inserted 1,000,000 during that time. More than likely the player began the game with at least 80 times his bet (for instance there are 80 quarters in 20). The odds are never about winning.