Here is a list of potential restrictions and regulations on private ownership of slot machines in the United States on a state by state basis. Note that these regulations are subject to change without notice and are not fully guaranteed to be completely accurate.

State
Age of Machine
Legal Status

Alabama
Any Class II
LEGAL

Alaska
Any machine
LEGAL

Arizona
Any machine
LEGAL

Arkansas
Any machine
LEGAL

California
25 [...]

Skill With Prizes (SWP) machines are a subset of slot machines, in which the payout a player receives is dependent on a game of skill rather than just luck.One common type of SWP game is the Quiz machine – where a player has to answer a number of trivia questions to win [...]

A quiz machine is a type of slot machine in which the player must answer questions in addition to, or instead of, matching symbols. See also itbox. They are common in UK pubs, where they are often based on board games or game shows. In the UK these are “technically” termed “Skill [...]

A progressive jackpot is a jackpot (highest payoff) for a gaming machine (usually a slot machine or video poker machine) where the value of the jackpot increases a small amount for every game played. Normally multiple machines are “linked” together to form one large progressive jackpot that grows more quickly because [...]

Pachinko (パチンコ) is a device used for amusment and prizes and is related to pinball machines. Although originally strictly mechanical, modern pachinko machines are a cross between a pinball machine and a video slot machine. Pachinko is said to have been invented sometime after World War II in Nagoya, though the [...]

“Hot” and “Cold” machines
Standard slot machines do not get “hot” or “cold”. The odds of hitting a winning combination are determined by a random number generator contained in the machine’s software and is exactly the same with every spin. Such slot machines are never “due to be hit” if they haven’t paid [...]

United States
In the United States, the public and private availability of slot machines is highly regulated by state governments. Many states have established gaming control boards to regulate the possession and use of slot machines. Nevada is the only state that has no significant restrictions against slot machines both for public [...]

Random number generator
It is a common belief that the odds on a machine have something to do with the number of each kind of symbol on each reel, but in modern slot machines this is no longer the case. Modern slot machines are computerized, so that the odds are whatever they are [...]

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. Some [...]

A person playing a slot machine purchases the right to play by inserting coins, cash, or in newer machines, a bar-coded paper ticket (known as “ticket in/ticket out” machines), into a designated slot on the machine. The machine is then activated by means of a lever or button, or on newer machines, [...]

Sittman and Pitt of Brooklyn, New York developed a gambling machine in 1891 that could be considered a precursor to the modern slot machine. It contained 5 drums holding a total of 50 card faces and was based on poker. This machine proved extremely popular and soon there was hardly a bar [...]

A slot machine (American English), poker machine (Australian English), or fruit machine (British English) is a certain type of casino game. Traditional slot machines are coin-operated machines with three or more reels, which spin when a lever on the side of the machine is pulled. The machines include a currency detector [...]