General rules:
The player chooses a bet and taps the "SPIN" button. The size of the player's win depends on the symbol combinations that appear on the reels. Payout rules may vary greatly depending on the slot. Details of the game rules for each specific slot can be found in the respective machine's pay table by tapping the "i" button. Below are descriptions of popular mechanics that are the most common in slots.
Payline Wins
A slot machine can have 1, 100, or even more paylines. By tapping the "SPIN" button, the player makes a total bet, which amounts to the number of slot paylines multiplied by the bet per payline. Thus, the player bets a fixed amount of chips on each payline. The number of paylines is fixed for each slot and can be found in its paytable.
The player wins on a payline if several matching symbols appear on it. Furthermore, the symbol combination is counted from left to right. Combinations consisting of 3 or more symbols are usually considered winning. If a winning combination appears on a payline, the player receives a reward that is equal to the bet per payline multiplied by the combination value. Values of each winning combination are shown in the slot paytable.
The total win is equal to the sum of wins on all paylines.
WILD Symbol
When calculating the win on the payline, the WILD symbol is substituted by the symbol that will help form the most profitable combination on the given payline. Under normal circumstances, the WILD symbol cannot be substituted by the FREE SPINS or BONUS symbols.
FREE SPINS Symbol
The player may win several free spins over the course of the game. The player is not charged any chips for free spins. Moreover, the win is calculated based on the bet per payline from which the player has received free spins. The player may not raise the bet during free spins.
Free spins usually start when 3 more or FREE SPINS symbols are stacked anywhere on the reels, regardless of the paylines. The more FREE SPINS symbols appear on the reels, the more free spins the player receives.
BONUS Symbol
A slot may have one or several kinds of bonus games. The bonus game usually interrupts the spins and takes places on a separate screen. Bonus game rules vary greatly depending on the slot.
A bonus game usually starts when 3 or more BONUS symbols are stacked anywhere on the reels, regardless of the paylines. The size of the bonus game win depends on the bet that was made when the bonus was received, and on the number of the special BONUS symbols that triggered the bonus.