AvalancheA specific branded style of cascading reels in which symbols crumble away after a win and a multiplier typically steps up with each consecutive fall.core
Base GameThe standard, everyday spinning of a slot outside of any bonus round or free-spin feature.beginner
Bonus BuyAn option to pay a fixed price to trigger a slot's bonus feature immediately instead of waiting for it to land naturally.core
Cascading ReelsA mechanic where winning symbols are removed and new ones fall in to fill the gaps, allowing chained wins from a single spin.beginner
Configurable RTPA game released with several selectable return-to-player versions, letting the operator deploy a higher or lower RTP variant of the same title.advanced
Expanding WildA wild symbol that stretches to cover an entire reel (or row) after it lands, turning every position it fills into a wild.core
Feature FrequencyHow often a slot's main feature, such as free spins, is triggered on average, usually stated as roughly one in so many spins.core
Fixed JackpotA top prize set at a constant value that does not grow with play, unlike a progressive jackpot.beginner
Grid SlotA slot laid out as a symbol grid (such as 6x5 or 8x8) rather than classic separate reels, usually paying by clusters or scatter pays.core
Hold and WinA feature where special symbols lock in place and grant respins, resetting the respin count each time a new one lands.core
Multiplier (Slots)A value that multiplies a win by a stated factor, such as x2 or x10, increasing the payout for that combination.beginner
Must-Drop JackpotA jackpot guaranteed to pay out before it passes a set value, time, or condition, though not necessarily to a particular player.advanced
Mystery SymbolA placeholder symbol that reveals or transforms into another symbol after landing, with the revealed identity decided by the game's RNG.core
Near-Miss (Anticipation)A losing outcome displayed to look like it just barely fell short of a win, often heightened by reel-slowing anticipation animations.advanced
Network (Wide-Area) JackpotA progressive jackpot pooled across many games, operators, or sites so it grows quickly to very large sums.advanced
Nudge and HoldA classic-slot feature that lets a reel shift by one position (nudge) or lets the player keep chosen reels for the next spin (hold).core
Pick BonusA bonus round where the player selects from hidden objects to reveal prizes, though the outcomes are predetermined at random.beginner
Reel StripThe ordered list of symbols that makes up a single reel and defines how often each symbol can appear.advanced
RespinAn additional spin of one or more reels, usually granted for free, while other symbols are held in place.beginner
RetriggerActivating a bonus feature again from inside that same feature, typically to add more free spins.beginner
Scatter PaysA win rule where a set number of matching symbols anywhere on the grid pays, regardless of position or paylines.core
Stacked SymbolsIdentical symbols grouped in a vertical block on a reel so they can fill several positions of that reel at once.core
Sticky WildA wild symbol that stays locked in its position for one or more following spins instead of disappearing after a single spin.core
Walking WildA wild that shifts one reel across the grid on each successive spin, often granting a respin until it leaves the screen.advanced
Weighted ReelsA design where symbols or reel stops are given unequal probabilities, so some appear far more often than an even layout would suggest.advanced
Wheel BonusA bonus round where the player spins a segmented wheel and is awarded whatever prize the pointer lands on.beginner
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Definitions stay evergreen; the rules around them don't. Get a short, cited note when something in iGaming changes. Independent, 18+, no hype.