Slot Features Explained: Wilds, Scatters, Free Spins & More

Why Slot Features Matter in Modern Online Slots

If anyone takes a moment to think about what makes a modern online slot game attractive, initially it would most likely be the audio-visual themes, with vibrant colors and imagery, and the diverse array of sounds it creates, whether musical or otherwise.

But other than the eye-catching graphics, animation, and engaging soundtracks, the attraction will often lie in the particular slot features each game offers.

This article explains the different types of features found in modern online slots and the different effects each one has on gameplay, including their slot game mechanics and how they use modern online casino software.

For new players who may find online casinos overwhelming at first glance, understanding slot features and what they bring to each game, will go a long way to improving their iGaming experience.

What Are Slot Features?

Slot Features are essentially the added extras that are included in each online slot’s individual gameplay.

There are Wild symbols, Scatter symbols, Free Spins (or Free Games), Slot Multipliers, and online slot Bonus Features, all of which add a unique depth to each spin and each game.

Each game won’t necessarily include all of these features, and even the features themselves won’t be exactly the same on each game depending on online slot mechanics, but each slot should, and will have, a feature that makes that game more appealing, more exciting, and more profitable.

It’s these distinctive and attractive features that experienced slot game providers, such as Endorphina, will take great skill and practice in producing and making each one as innovative, and unique, as possible.

Wild Symbols Explained

These interestingly titled symbols substitute for others to create a winning line. Think of a Joker in a pack of cards if it was included in a game as a maverick with extra powers, hence the term ‘Wild’.

Due to this extra advantage, Wilds are also split into different versions such as Expanding, Sticky, and Stacked Wilds.

Expanding Wilds

Expanding Wilds can stretch vertically or horizontally across the reels, covering additional symbol spaces, hence the name. This feature boosts winning potential by reducing the number of matching symbols needed for a payout and, in some games, can help trigger the highest-value rewards.

Sticky Wilds

These Wild symbols remain fixed in place for a set number of spins, often during free spin features, while the remaining reels continue to spin.

Hence the name, ‘Sticky’. Their continued presence increases the likelihood of forming winning combinations while they stay or stick on the screen.

Stacked Wilds

Stacked Wilds, as the name would suggest, appear stacked together on top of each other on a reel or can also extend vertically to cover multiple positions. When they occupy an entire reel, they may merge into one large Wild symbol, greatly improving the chances of completing winning paylines.

For instance, in Endorphina’s Hell Hot 100, Fire symbols are Wilds, substituting for all symbols except Scatter. They appear stacked and may cover entire reels. Here, five Wilds pay 10X the base bet.

Wild symbols give players more opportunities to win by turning spins that might otherwise lose into winning combinations. This feature is often highlighted during bonus rounds, such as free spins, where Wild symbols may appear more frequently or gain added enhancements like multipliers.

The more varied that Wilds are, the better. In Endorphina’s 3 Witch Pots, Black Cat symbols are Wilds, substituting for all symbols except tokens. They can appear anywhere on any reel therefore increasing the prize potential even further.

Identifying which symbol is a ‘Wild’ should also be clearly stated in each game’s ‘information’ table.

Scatter Symbols Explained

Scatter symbols are typically used to trigger bonus features such as free spins or special bonus games. When a required number of Scatter symbols appear on the reels, usually three or more, these extra features are triggered.

Unlike regular symbols, Scatters do not need to land on a specific payline to count. As long as enough appear anywhere on the reels, the bonus is awarded, which is why they are referred to as “Scatter” symbols.

Knowing what the ‘Scatter’ symbol looks should also be explained in the relevant ‘information’ table, which should also be easy to find in the game menu.

A good version of this in action is 2026 Hit Slot, by Endorphina, where the Scatter is a Gold Star. Landing 5 Scatters pays 500X the base bet.

This is also an attraction in 2025 Hit Slot, by the same online slot provider, where the Gold Coin Scatter in the main game may activate the Coin Cascade feature and trigger the Hit Win Jackpot Bonus Game. 5 Scatters here also pay 500x the base bet.

Free Spins (or Free Games) Explained

The term ‘Free Spins’ is perfectly understandable. Spins (or Games) which are free.

This very popular bonus feature awards players a certain number of extra spins without using additional balance funds.

For instance, landing three or more Scatter symbols may trigger a free spin round granting 10, 20, or even more completely complimentary spins.

During these spins, players can still collect winnings and may also benefit from added features such as extra multipliers or other special bonuses linked to this particular free spin structure.

One of the main advantages of free spins is that they extend gameplay with no extra costs, making them especially appealing to newer players who are still becoming familiar with online slot mechanics.

A good example is in Burning Hell 3000, by Endorphina, where the Pick Me Bonus Game offers regular prizes up to 500X in total bets, plus Min, Mid, Max, and Ultra Jackpots up to 1000X.

Another impressive one by the same game studio is Crown Coins, where the Royal Treasury Bonus Game offers regular prizes up to 15X in total bets, plus Min, Mid, Max, and Ultra Jackpots up to 1000X.

Take note that the number of free spins and any accompanying rewards vary depending on the game’s rules. Once again, do check the ‘information’ table to review the pay table and understand how the games free spins work.

Multipliers & Bonus Features

Multipliers are special features that boost winnings by applying a pre-fixed factor to a payout. For example, if a player wins $10 and a pre-set 5x multiplier is active, the total payout becomes $50.

As expected, they are among the most sought-after features in online slots because they can greatly increase returns without requiring additional effort from the player.

Multipliers can be activated in several ways, such as landing specific symbols or entering bonus rounds. Some apply to total winnings, while others only affect line bets or free spins.

Types of Multipliers

Most types of multipliers can come in numbers like 2x, 3x, 5x and even 10x to 100x whereas Multiplier Accumulators would grow over time or increase during bonus features, similar in concept to building a jackpot.

Multipliers can be activated in several ways, such as gaining specific symbols or entering bonus rounds. Some apply to total winnings, while others only affect individual line bets or free spins.

For example, certain symbols like Wilds or Scatters, may carry multiplier opportunities and some can even appear randomly in a game.
But it’s with Free Spins and bonus games/rounds where multipliers appear mostly.  

In slot provider, Endorphina’s Fortune Bankers, players can activate 20 Free Games with Multiplier Accumulators of up to 1000X, whilst in Burning Coins 20, 6+ coins trigger the Fiery Fortune Bonus Game, carrying multipliers up to 25X.

Other types of Bonus Features

Another Bonus Feature could be a Risk Game (or Gamble Game). In this, a player can significantly increase their winnings by choosing one of four random cards dealt out face down by a Dealer who will be allocated one random card.

If the Dealer’s card wins, the Dealer takes the winnings and the game ends, but if the player’s card wins, the win is doubled.

In some cases, such as with games created by Endorphina, the player will be able to try again up to 10 times, making it a very attractive, if risky, bonus option.

There is also a Bonus Feature called Jackpot Collecting.  In Endorphina’s Fortune Chests, players can collect various coins of different values. Collecting 5 Ultra coins pays out 500X the total bet. 

Why Slot Features Matter

With all these features explained, it should now be apparent how each one affects player engagement, gameplay variety, and even volatility.
For example, if an online slot game includes multiple Wild symbols that can trigger large payouts or unlock jackpot bonus features, it will usually fall on the higher end of the volatility spectrum.

This is where online slot mechanics, such as Return to Player (RTP), the percentage of all wagered money that a game is designed to pay back over time, would also come into play.

Each game incorporates rich storylines, immersive sound effects, and concepts inspired by everything from ancient myths and legends, enchanting fairy tales, and classic fruit slot machines, to action sports, modern pop culture, dice games but it’s the features that will make each game truly unique.
Remember, though, that not all modern online slots will include all of the features.

Already Know Your Favorite Slot Features?

Now that you understand how slot features work and what they bring to the gameplay experience, it’s easier to find games that match your playing style.

Whether you enjoy Wilds, Scatters, Free Spins, Multipliers, or Bonus Games, knowing what each feature does can help you make more informed choices and get more enjoyment from every spin.

Most reputable online casinos and game providers, including Endorphina, offer free demo slots, allowing you to try different games and features before playing for real.

Explore Endorphina's slot portfolio and free demo slots.