Gambling terms, explained straight

Slots & Gaming Machines

Jackpot machine

A jackpot machine is a reel-based gambling device, often called a slot or fruit machine, that can award a jackpot prize.

Also called
fruit machine, slot machine, jackpot gaming machine12
Max charge (non-casino UK)
50 pence2
Max charge (casino UK)
£100 where max prize ≤ £500; otherwise £22

Key points

  • Outcome is determined by random numbers at the moment play is initiated, not by hot or cold cycles.34
  • In progressive variants, the jackpot may be tied to a meter or pre-set trigger rather than the reel outcome.56

Common questions

How to play jackpot machine?

Insert coins or a note, select your bet size, and press spin or pull a lever. The reels spin and stop randomly; matching symbols across paylines can win you a prize, including the jackpot.

How jackpot machine works?

A random number generator determines the outcome of each spin the moment you press play. The machine pays prizes based on the symbol combinations that land, with the jackpot often triggered by a specific rare combination or a separate meter.34

Slots Slot machine jackpot Explains the jackpot prize itself on a slot machine. Slots Slot machine Covers the general category of reel-based gaming machines. Slots Progressive jackpot Describes jackpots that increase with each bet placed. Slots Jackpot symbols Lists the symbols that can trigger a jackpot win. Slots Progressive jackpot slots Focuses on slot machines with progressive jackpot features. Slots Slot machine reels Explains the spinning reels that determine outcomes.

Sources

  1. Gaming machine categories gamblingcommission.gov.uk Defines gaming machines and confirms 'jackpot machine' as a term for slot/fruit machines.
  2. The Gaming Act 1968 (Variation of Monetary Limits) Order 2005 legislation.gov.uk Sets the legal monetary limits for jackpot gaming machines in the UK.
  3. Slot Machines wizardofodds.com Explains that slot outcomes are determined by random numbers at the time of play.
  4. スロットマシン> 仕組み、オッズ、アドバイス、無料プレイ jp.wizardofodds.com Confirms the random outcome mechanism for slot machines.
  5. Must-Hit-By Progressives wizardofodds.com Describes how progressive jackpots can be tied to meters or triggers rather than reel outcomes.
  6. Must-Hit-By Jackpots -- 1/4/2019 - Wizard of Odds wizardofodds.com Further details on progressive jackpot mechanics.

Sources are drawn from regulators, universities and published research, and each one is labelled with what it actually is — a preprint is not called a paper. Bookmaker and affiliate pages are never cited here, because a page that sells betting is not a neutral authority on it.

Written and maintained by Ellis Warrender, writer and maintainer.

Last updated 28 July 2026. Spotted an error? Tell me and it gets fixed and logged on the corrections page.