Feature trigger meaning: a feature trigger is the event in a slot that starts a bonus feature, most often landing three or more scatter symbols, though some games trigger at random or after filling a meter. The trigger is decided by the same random result as every other spin, so a feature is never 'due'.
A feature trigger is the combination or event that starts a bonus round.
Scatter triggers are most common; random and collection triggers also exist.
Trigger chances are fixed per spin; long gaps don't make one more likely.
Slots supplied to Great Britain don't let you buy the feature, so triggering is the only route.
Most common trigger
3 or more scatter symbols
Other types
Random, collection or meter, special symbols
Decided by
The RNG result of the spin
Published?
Trigger rules on the help screen; rates sometimes
Feature buy in GB
Not offered
Feature trigger meaning in plain terms
Most video slots have a base game and one or more features: free spins, a pick-and-click bonus, a hold and win round, a bonus wheel. The trigger is the condition that moves you from the base game into a feature. It is written in the game rules, usually something like 'three or more scatters anywhere on the reels award 10 free spins'.
Whatever the trigger looks like, the outcome was fixed the moment you pressed spin. The random number generator picks the result and the reels then display it. The animation of scatters landing one by one is presentation, not a process you can influence.
Worked example: what a feature trigger costs on average
Some studios publish an average trigger rate, such as 'free spins hit about 1 in 200 spins'. Suppose that figure applies and you stake 20p a spin. On average you'd stake 200 × 20p = £40 between features. That doesn't mean the feature 'costs' £40: the base game pays some of that back, and the feature pays out the rest of the game's return. It does mean that a £10 budget, worth 50 spins, will often end without a trigger.
The rate is an average across millions of spins. Some features land twice in ten spins; others take 800. After 300 spins without one, the chance on the next spin is still 1 in 200, which is the gambler's fallacy in action. Our page on hit frequency explains related figures, and the volatility entry shows why feature-heavy games swing more.
Where you meet feature triggers
In the paytable and rules: 'Trigger' or 'How to win free spins' sections.
In base-game anticipation effects: reels slowing when two scatters have landed (see near miss).
In offer terms: free spins winnings from an offer can include features triggered during those spins.
Inside the feature: some rounds let you trigger again (a retrigger).
On Big Bass Bonanza, which PlayOJO's welcome spins are played on, the free spins feature is triggered by scatters; our Big Bass Bonanza free spins page covers the game in an offer context.
Feature triggers and UK slot rules
Three British rules bear directly on triggers. First, slots supplied to Great Britain don't offer feature buys, so you can't pay a lump sum to skip to the feature; this reflects how games are supplied for the market rather than a dated rule (see no bonus buy). Second, since 31 October 2021 slots can't celebrate a return equal to or below the stake, so a feature paying back less than you've staked shouldn't be dressed up as a win; the Commission's summary of RTS changes (opens in a new tab) has the wording, and our page on the losses disguised as wins ban explains it.
Third, the stake limits treat a feature as part of the same game cycle that triggered it. The stake limit guidance (opens in a new tab) says a cycle runs until all stakes are lost or all winnings delivered, and further stakes within the cycle count towards the £5 or £2 cap. Autoplay and turbo modes are also banned, so each spin chasing a trigger has to be started by you and take at least 2.5 seconds.
Why the trigger matters when picking a slot
Games that hold much of their return back for rare features feel very different from games that pay little and often. If a feature is hard to trigger, base-game spins will mostly lose, and sessions on a small budget often end without seeing it. Reading the trigger rules and volatility guide before you play sets realistic expectations, and a time or deposit limit keeps the search for a feature from running on.
Where to play slots with scatter-triggered features
PlayOJO (18+, new UK customers excluding Northern Ireland): make a first deposit of at least £10 and receive 80 free spins on Big Bass Bonanza at 10p each, worth £8 in total. Features you trigger during those spins count as part of the spin winnings, which are paid in cash with no wagering. The offer can't be combined with others and works only via the designated link.
Coral (18+, new players, until 1 February 2027): deposit and bet £10 or more on slots for 100 free spins at 10p on selected games, accepted within 48 hours and used within 7 days, with no wagering on winnings; PayPal, Skrill, Neteller, Paysafe, prepaid cards and some debit cards don't qualify. Both checked 5 October 2026; terms apply. More on our PlayOJO free spins page.
PlayOJO's spins are on Big Bass Bonanza, a scatter-triggered free spins slot; Coral's spins are on selected slots. Checked 5 October 2026; 18+, terms apply.
Significant terms: 18+. New players only. Offer runs 01/10/2026 to 01/02/2027. Deposit (certain types excluded) and bet £10+ on slot games to get 100 free spins (selected games, £0.10 each, 48 hrs to accept, valid 7 days). No wagering on free spin winnings. Deposits by Neteller, PayPal, Paysafe, Skrill, prepaid cards and certain debit cards do not qualify. Restrictions and T&Cs apply. GamCare.org.uk
Read the Coral reviewLicence: LC International Limited, UKGC account 54743. Offer checked 5 October 2026.
Significant terms: 18+. New UK customers (excluding Northern Ireland). First deposit only. Minimum deposit £10. 80 free spins on Big Bass Bonanza, £0.10 each. No wagering requirements; winnings paid in cash. Cannot be used with any other offer. Only available to players who arrive through the designated offer link. Full T&Cs apply. GamCare.org.uk
Read the PlayOJO reviewLicence: Skill On Net Limited, UKGC account 39326. Offer checked 5 October 2026.
18+. Gambling should be entertainment that costs money, not a way to make it. Set a deposit limit before you play: how to set deposit limits. Free, confidential help: National Gambling Helpline 0808 8020 133.
Frequently asked questions
What does feature trigger mean in slots?
A feature trigger is the event that starts a slot's bonus feature, such as free spins, a pick bonus or a hold and win round. The most common trigger is three or more scatter symbols landing anywhere on the reels, but features can also start at random, from special symbols on set reels, or by filling a meter. The trigger rules are on the game's help screen. Our guide to how slot bonus rounds work explains what happens once the feature begins.
How often do slot features trigger?
It varies by game. Some studios publish an average trigger rate in the help screen or game sheet, and the figures differ widely between games; many don't publish one at all. Even where a figure is given, it is a long-run average: real gaps between features are often far shorter or far longer. High-volatility games tend to trigger less often but pay more when they do. Our page on slot hit rate explains how to read these figures and why a short session rarely matches them.
Is a slot feature ever due to trigger?
No. Each spin is independent, and the chance of triggering is the same on every spin regardless of how long it has been since the last feature. A game that averages 1 in 200 has the same 1 in 200 chance after 500 dry spins as after one. Believing otherwise is the gambler's fallacy, and it tends to lead to longer sessions and bigger losses. Our gambler's fallacy guide explains the idea with worked examples.
Can I buy the bonus feature at UK casinos?
No. Slots supplied to UK-licensed casinos don't include a feature buy option, so the only way into a feature is to trigger it during normal play. You may see bonus buy versions mentioned on overseas sites, but those aren't available from British-licensed operators. We describe this as how games are supplied for Great Britain rather than a dated rule, because no official Commission source confirms a ban. Our page on no bonus buy explains the position as it stands.
Do free spins from an offer count if they trigger a feature?
Usually yes. If you trigger a feature while using offer spins, its winnings count as part of the spin winnings and follow the offer terms. With no-wagering offers such as PlayOJO's 80 spins or Coral's 100 spins, those winnings are paid without a playthrough requirement. Some offers cap free spin winnings, so check the terms. Our guide to free spins winnings explains how different offers credit feature wins and what limits to look for.
Why do reels slow down when I have two scatters?
That is an anticipation effect: the game slows the last reels to build suspense when a trigger is possible. The result was already decided by the RNG before the reels stopped, so the slowdown doesn't change the outcome. Since 2021, UK rules ban turbo and slam-stop functions that let players shorten a spin, but anticipation animations remain common. Our near miss entry explains why almost-triggers feel significant even though they tell you nothing about the next spin.
Does a bigger stake trigger features more often?
In most slots, no. The trigger chance is the same at every stake; a bigger stake simply makes the feature's payout bigger in pounds. A few games scale certain features or jackpot chances with stake, or offer an extra-bet mode that raises trigger chances for a higher cost, and the help screen will say so. Any such mode still counts towards the £5 or £2 UK cap. Our explainer do bigger bets win more? runs through the numbers.
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