Best of Bonus
Triggers three consecutive bonus rounds and awards the highest-scoring round.
Slot Features Explained and Standardized
Explore 228 mechanics identified through examination of individual games. We classify features by how they work, with explanations and interactive demos that make their similarities and differences easier to understand.
All FeaturesBonus GameFree SpinsJackpotScatterSpecial BettingSpecial ReelsSpecial SymbolsUnique PaysUnique SpinsWild
Burst Mode
Burst Mode is an accelerated auto-play option that runs spins at high speed, minimizing animations and displaying only aggregate win results.
Cashback Bonus
The Cashback Bonus is a unique feature that activates when 35-50 games have passed since the last bonus, a 'Mystery BOX' and 'Mystery KEY' symbol appear on reels 3 and 4, and the player's credit balance is lower than the minimum bet, awarding a random percentage of total bets made since the last bonus.
Electric Reels
Electric Reels introduce a dynamic reel state that causes landing wilds to expand fully and double their multiplier, significantly boosting win potential.
Persistent Free Spin Grid
In the bonus game, the destruction progress of the game grid (cleared blocks or empty spaces) is preserved across all free spins, with the grid not regenerating its original state between spins.
Identical Symbol Count Multiplier
An additional multiplier is applied to the total spin prize if a specified number of identical regular symbols appear anywhere on the game grid.
Link Frames Random Transformation
A feature where special 'Link frames' appear, transforming symbols within them into random symbols, with these frames persisting throughout the free spins bonus.
Rewind Evaluation (Free Spins)
In Rewind Free Spins, a second evaluation of the game board occurs after the initial evaluation and all cascades (tumbles) are complete, where selected positions from the first evaluation become Sticky Wilds for this re-evaluation.
Spin-Based Feature Unlock Progression
A meter tracks the total number of spins played, and upon reaching specific spin milestones, new game features are permanently unlocked, enhancing subsequent gameplay.
Wild Instant Prize Collector
An Expanded Wild symbol, upon landing on the reels, collects all visible Instant Prize symbols on the screen, awarding their combined values to the player.
Duel Mechanic
This feature triggers a dynamic 'duel' between two wizard symbols, where the winning wizard transforms into a powerful 'Over-Wild' with an applied multiplier, enhancing subsequent wins.
Feature Symbol Transformation
This feature allows a special symbol appearing on the grid to transform itself into one of several predefined feature symbols, such as an Instant Prize, Multiplier, or Collector symbol, activating their respective bonus effects.
Crusher Symbols
Crusher Symbols are special symbols that appear above the reels, drop down their respective columns, and remove lower-value symbols, awarding cash prizes or boosting a global multiplier.
Independent Position Reels
This feature redefines the game grid, transforming each individual position into its own independent spinning reel, creating unique winning dynamics.
Conditional Wild Win
This feature only awards payouts for winning lines involving a wild symbol if it is followed by a Bonus or Special Bonus symbol, introducing a new strategic layer to wild mechanics.
Designated Feature Reels
Designated Feature Reels are specific reels within the main game grid that are pre-assigned to host unique dormant features, which activate under specific trigger conditions involving other symbols and can be progressively upgraded.