Accumulating Multiplier
A feature where the multiplier does not reset during a bonus round, but instead accumulates or grows.
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
Accumulating Multiplier Wild
A wild that has its own multiplier, which accumulates and grows according to specific conditions.
Accumulative Trigger
A feature that visually accumulates special symbols in a pot or basket, creating anticipation for a random bonus trigger.
Activated Position
A base game mechanic where, after each spin, one random grid position is activated, either awarding the value of a prize symbol or transforming a mystery symbol in that spot.
Activation Field
A two-stage payout system where you first create special 'fields' on the grid, which are then activated by a separate 'activator symbol' to release rewards.
All-Ways
A payout system where wins are formed by landing matching symbols on adjacent reels from left to right, regardless of their position.
Ante Bet
A betting mode where you pay extra to artificially increase the probability of entering the bonus feature.
Area Symbol Transformation
A feature where a random symbol on the grid is selected as a "Marked Target," and all symbols within a 3x3 or 5x5 area surrounding it transform to match that target symbol.
Auxiliary Prize/Multiplier Reel
Auxiliary Prize/Multiplier Reel is a unique vertical reel that spins independently alongside the main game grid, applying either win multipliers or fixed jackpot values to any wins on the main reels.
Auxiliary Triggered Reel
An additional reel positioned above the main game grid that spins independently and awards multipliers or a collector symbol when a full stack of identical symbols appears on a corresponding main reel.
Bet Chance
A unique "second chance" feature triggered by a low player balance, offering a mini-game to win an additional full game spin.
Bet Slip
A unique betting option where players place side bets on the appearance of specific symbols during gameplay, with payouts based on their individual odds.
Block Set Upgrade
If all block symbols are destroyed in a cascade, then for the rest of the game round, only Multiplier, Bonus, and Gem blocks will appear in the blocks area.
Blocker Removal
A feature that expands the game board and increases the ways to win by removing 'blocker symbols' that obstruct parts of the reels.
Board Game Bonus
A bonus where you move a character or a light on a board game, winning the prize of the space you land on.
Bonus Buy
A feature that allows players to pay a set price to instantly trigger free spins or a bonus round.