WD138 is a minigame that occurs on a slot machine's reels. It can be triggered by specific symbols or by a special event. These games usually follow a theme. Some may also cap max wins.

A progress bar is a feature that fills up as you hit certain combinations, potentially awarding a jackpot, a free spins bonus game or other prizes. It may also be combined with a multiplier for larger payouts.


In slot bonus, symbols play an important role in determining the odds of winning. They can be standard or special symbols. Some symbols can also act as multipliers or sticky wilds that increase your chances of creating a winning line. These features give players an increased chance of hitting the jackpot and provide a dopamine kick that keeps them playing.

While the technology behind slot machines has evolved beyond recognition, their symbols have remained consistent. This is due to tradition and a belief that gamblers like familiarity. These symbols include bar and fruit symbols.

In slots with cascading reels, winning combinations are triggered when identical symbols align on a payline. These combinations can be straight or zig-zag and can occur on multiple reels. Regular paying symbols usually include the letters A (Ace in card games), K (King), Q (Queen), J (Jack) and T (Ten). However, each slot game has its own set of standard symbols.


Paylines are one of the most important aspects of slot games. They determine how much a player can win in a single spin. Some slots have fixed paylines while others allow players to adjust the number of lines they want to play. However, reducing the number of paylines can decrease the hit frequency and the amount of money that players can win in a single spin.

Payline patterns vary from slot to slot, but most feature a standard straight line that must match the winning symbols in order to payout. Some have innovative patterns, like zig-zags or diagonals. Some even offer multiple ways to win, such as 243 Ways to Win, which makes it easier to hit a five-of-a-kind symbol combination.

It is important for slot players to understand how paylines work, especially when choosing a slot game. If they do not know how to calculate a payline's probability of winning, they can miss out on some large payouts.

Bonus events

Bonus events in slot games are designed to break up the monotony of repetitive spinning and offer players a way to generate new excitement. They typically guarantee added payouts but are not intended to wipe out the casino's bankroll. These added features are a vital part of modern-day slots.

They can be triggered by scatter symbols or a dedicated button on the gaming interface. A player's best bet is to check the game's paytable for details on each added feature. Most online casinos display this information on the main screen near the options, autoplay, and settings buttons.

A popular addition to slots is the ability to skip the base game and move straight into the bonus round. This is particularly useful for highly volatile games that can take a long time to trigger. This option is often backed by a sensible wagering requirement and is provided by many of the biggest casino software providers. Plot-based slots, such as murder mysteries or soap operas, are also growing in popularity and often incorporate a bonus event into their storyline.


RTP is the percentage of total bets that a slot machine will pay back to players over a large number of spins. This value is calculated by experts and it's based on millions of games played. It's important to know that this figure does not guarantee your chances of winning, and it can vary based on your individual game preferences.

Some of the highest RTP slots online are Fruit Shop and Mega Joker from NetEnt. These classic slots replicate the traditional fruity machines found in brick-and-mortar casinos and provide some of the best odds around. They also have a slight skill element, as you can choose whether to collect your winnings or take them into the Supermeter bonus game.

Another top slot with a high RTP is Dead or Alive, which combines a Wild West theme with an arresting video slot. This renowned game from NetEnt has been a hit in the world of online gambling and even spawned its own sequel.