Bonus is a special feature of the particular game theme, which is activated when certain symbols appear in a winning combination. In the bonus, the player is presented with several items on a screen from which to choose. As the player chooses items, a number of credits is revealed and awarded. There are bonuses that use a mechanical device, such as a spinning wheel. It is used in conjunction with the bonus for displaying the amount won.
A light on top of the slot machine is Candle. It alerts the operator that change is needed, hand pay is requested or there is a potential problem with the machine.
Slot machines in a circle or oval formation are usually called Carousel.
There is a container where the coins that are immediately available for payouts are held called Coin hopper. When a player collects credits this mechanical device rotates coins into the coin tray. There is a coin diverter used for redirecting excess coins into a drop bucket, or drop box when a certain preset coin capacity is reached.
A visual display of the amount of money or credits on the machine is called Credit meter.
Drop bucket or Drop box is a container located in a slot machine's base where excess coins are diverted from the hopper. Typically low denomination slot machines use a drop bucket. A drop box can be found in high denomination slot machines. The difference between a drop box and a drop bucket is a hinged lid with one or more locks. The contents of drop buckets and drop boxes are collected and counted by the casino on a scheduled basis.
EGM is used as a short-hand for Electronic Gaming Machine.
Hand pay refers to a payout made by a slot attendant or cage, rather than the slot machine. A hand pay occurs when the amount of the payout is more than the maximum amount that was preset by the slot machine's operator. At the level where the operator must begin to deduct taxes the maximum amount is set. A hand pay can also be a result of a short pay.
Hopper fill slip is a document used to record the replenishments of the coin in the coin hopper after it becomes depleted as a result of making payouts to players. The slip indicates the amount of coins placed into the hoppers, the signatures of the employees involved in the transaction, the slot machine number and the location and the date.
Low Level or Slant Top slot machines are equipped with a stool for you to sit and play. Stand Up or Upright slot machines are played while standing.
The term Optimal play is used to denote a payback percentage based on a gambler using the optimal strategy in a skill-based slot machine game.
A straight or zigzagged line that crosses through one symbol on each reel, along which a winning combination is evaluated is called Payline. Up to nine pay lines are contained by classic spinning reel machines and video slot machines contain up to a hundred ones.
The process of dramatizing a win by playing sounds while the meters count up to the amount that has been won is Rollup.
The term Short pay is used to mean a partial payout made by a slot machine, which is less than the amount due to the player is called Short pay. It can happen if the coin hopper has been depleted as a result of making earlier payouts to players. An attendant will come and re-fill the machine or the remaining amount will be paid as a hand pay.
The manufacturer for all slot machines provide them with a document called Theoretical Hold Worksheet. It indicates the theoretical percentage that the slot machine should hold based on adequate levels of coin-in. The reel strip settings, number of coins that may be played, the payout schedule, the number of reels and other information is indicated in the worksheet.
The dollar amount of coins or tokens removed from a slot machine's drop bucket or drop box and counted by the casino's hard count team through the use of a weigh scale is called Weight count.

You must know exactly the game you are playing.
You should know exactly how many coins you are supposed to insert into a machine. Your credits should be cashed out before you leave the machine.
Just have fun. Slots should be fun, not stressful. You can increase your bets only when you are winning, and decrease your bets when you are losing.

United States
The United States state governments regulate the availability of slot machines. There are a lot of states that have established gaming control boards to regulate the possession and use of slot machines. There are no significant restrictions against slot machines in Nevada. In New Jersey slot machines are allowed only in hotel casinos operated in Atlantic City. Several states allow slot machines only on licensed riverboats or permanently-anchored barges. Only three horse tracks are allowed to have slot machines in Delaware. State lottery commission regulates them.

Native American Casinos
Native American casinos located in reservations are not permitted to have slot machines. It is permitted when the tribe first reaches a pact with the state in which it is located. Typically, a pact entitles the state to receive a fraction of the gross revenue from slot machines.

Classes Of Slot Machines
No federal law governs slot machines. There is no universal classification for all states. Some states have restrictions on the type of slot machines that can be used in a casino or other gaming area. A centralized computer system operates "Class III" (or "traditional") slot machines. The chance of winning any payout is the same with every play. You can find Class III slots in Nevada or Atlantic City more frequently. "Vegas-style slots" is another name for them.
There is a connection between "Class II" slot machines ("video lottery terminals" or "VLTs") and a centralized computer system. The determination of the outcome of each wager is fulfilled by it. The chance of winning a series of limited prizes is equal for each machine. There is a fee for each Class III game that the casino has to pay to the state. The state doesn't regulate Class II games so tightly.

Characteristics Of Class II Games
The player is playing not against the casino but against other players. They are competing for a common prize. Each game has a winner. Only when there is a winner the game stops. In a given set there is a certain number of wins and losses. Once a certain combination has occurred it cannot occur again until a new batch is initiated. There is a dependence of between the games. The player is an active participant of the game. The announced numbers belong to the same set of numbers for all players.

Characteristics Of Class III Games
The opponents are the player and the house. Each game is independent of previous games. Any possible outcome can occur in any game.

Slot Clubs
In American casinos there are "slot clubs" the membership of wich is free. A small fraction of the amount of money that is bet is returned in the form of comps. The cards are used to insert into the slot machines in these clubs. Comps or "cash back" from these clubs can make significant differences in the maximum theoretical returns.

Australia
Queen of the Nile (manufactured by Aristocrat) is one of the most popular Australian poker machine games. The term Gaming Machines is officially used to denote Australian slot machines. Australian-style gaming machines have video displays for stimulating physical reels. There are usually five of them. There are laws regulating the use of gaming machines in Australia which are created by State governments.
There are Gaming machines not only in casinos but also in pubs and clubs in some states. New South Wales was the first state to legalize this style of gambling. The year of 1956 was the year of their legalization in all registered clubs in the state.
The usage of particular forms of gaming machine is allowed in Western Australia.

The UK
Row of old fruit machines are usually known as fruit machines, one-armed bandits and AWP in Britain. Fruit machines can be met in pubs, clubs, arcades, and some take-away food shops. These machines commonly have 3, but can be found with 4 or 6 reels with around 16 or 24 fruit symbols printed around them. These reels are spun. The machine pays winnings if certain combinations of fruit appear. Slot machines seen in casinos and elsewhere around the world are similar to these machines. These games have lots of extra features. However, the jackpots from these fruit machines are strictly limited. There are some features of fruit machines in the UK. A player may be given the opportunity to hold one or more reels before spinning. The chance of winning can sometimes be increased. A finite number nudges following a spin is given to a player. A nudge is a single-step rotation of a reel of the player's choice.
The maximum payout for an individual game is different depending on the type and the location of the machine. Private members' clubs have "club machines". They have higher jackpots and are allowed to charge more per game.
The manner of operation of these machines is different from American slot machines. The jackpot can be won in each game independently.
The AWP fruit machine is played in Europe and in countries such as the Czech Republic, Russia, and Ukraine.

Slots In Japan
Japanese slot machines are known as pachisuro. They are a descendant of the traditional Japanese pachinko game. Slot machines are a fairly new phenomenon. They can be found in mostly in pachinko parlors and the adult sections of amusement arcades, known as game centers.
Regulation of the machines is fulfilled by IC chips. There are six different levels changing the odds of a "777". There are certain rules and regulations in spite of the many varieties of the machines.