🗓️ Game provider blog published on May 22, 2025
If you have ever played a Novomatic slot in a European casino, you already know the kind of experience Greentube brings online. As Novomatic’s digital division, Greentube is responsible for taking some of the company’s most recognizable slot titles and adapting them for online play.
Its catalog is built around familiar names, classic reel structures, and deluxe versions of games that many players already know from traditional casino floors. That is the main reason Greentube slots still hold a strong place in the online market.
Founded in 1998 under the name Dürrschmid & Reisinger, Greentube later became part of Novomatic in 2010. Today, the company is based in Vienna, Austria and operates as Novomatic’s digital division.
Greentube’s games are available across multiple regulated markets, including jurisdictions such as the UK, Malta, Italy, and other European regions, depending on the operator.
As part of the Novomatic group, Greentube focuses on bringing well known slot titles into the online space. Its portfolio includes games like Book of Ra, Lucky Lady’s Charm, Sizzling Hot, and Dolphin’s Pearl, which were originally popular on casino machines.
The main focus is not on reinventing slots, but on adapting familiar formats for online play. That includes keeping the same reel structures, bonus features, and overall pacing that players already recognize.
Here`s Top 5 Greentube slots:
Dolphin’s Pearl is one of the more recognizable Greentube slots, built on the same structure as several other Novomatic titles but with an underwater theme.
The game uses a standard 5 reel setup where wins are formed from left to right. The core of the gameplay revolves around the wild symbol (Dolphin), which can substitute for other symbols and double the value of a winning combination when it is part of it.
The main feature is triggered by landing three or more scatter symbols (Pearl) anywhere on the reels. This activates 15 free spins, where all wins are multiplied by x3. During this bonus round, the same feature can be triggered again, extending the session.
In practice, most of the value in this slot comes from the free spins. The base game is relatively simple, with steady pacing and no additional mechanics outside of the wild and scatter interaction.
What makes this game different is not the structure itself, but the combination of a simple base game and a consistent multiplier during free spins, which gives it a very predictable flow compared to more complex modern slots.
Theme: Sea / Dolphin
Volatility: Medium
RTP: Around 96%
Max Win: Up to 27,000x
Lord of the Ocean follows a structure that will feel familiar if you have played other Greentube titles. The setup is simple, with 5 reels and a fixed number of paylines, and the main focus is on the free spins feature.
The Gate symbol acts as a wild, substituting for most symbols in the base game. At the same time, landing three or more Gate symbols triggers the bonus round, which is where the core gameplay takes place.
During the feature, the game awards 10 free spins and randomly selects one symbol to become the expanding symbol. When this symbol appears on a reel, it expands to cover the full reel height, creating multiple winning combinations at once.
This mechanic is similar to what is seen in other Novomatic style slots, but here it is presented with a slightly different pace and theme. The base game remains straightforward, while most of the value comes from how often the expanding symbol connects during free spins.
There are also several versions of this game, including Lord of the Ocean 10, Lord of the Ocean Bonus Spins, and Lord of the Ocean Magic, which follow the same core structure with slight adjustments depending on the release.
In practice, the gameplay depends heavily on the bonus round. Without it, the base game tends to move slowly, but once free spins are triggered, the potential comes from repeated expansions across the reels.
Theme: Mythology, underwater setting
Volatility: Medium-High
RTP: Around 95%–96% depending on the version
Max Win: 27.000x
Sizzling Hot Deluxe is one of the simplest games in the Greentube portfolio, built around a classic 5 reel, 5 line setup with no bonus rounds or additional features.
Wins are formed by matching symbols from left to right across fixed paylines, while the scatter symbol (Star) pays regardless of its position. Outside of that, the game does not rely on any extra mechanics, which keeps the entire experience focused on the base game.
What defines this slot is its structure. There are no free spins, no expanding symbols, and no layered features. Everything depends on symbol combinations and line hits, which gives it a steady and predictable rhythm.
Compared to other Greentube titles, this is one of the few games where the outcome is not tied to a bonus round. Instead, all potential comes directly from the base gameplay, which is why it is often preferred by players who want a more straightforward experience.
There are also several variations of the game, including Sizzling Hot Extra Spins, Sizzling Hot 6 Extra Gold, Sizzling Hot Twin Spinner, and Sizzling Hot Quattro, each introducing small adjustments while keeping the same core format.
Theme: Classic fruit symbols
Volatility: Medium
RTP: Around 95%–96% depending on the version
Max Win: 5000x
Lucky Lady’s Charm Deluxe follows a very similar structure to other Greentube slots, but with one important difference that changes how the game plays.
The base game uses a standard reel setup where wins are formed from left to right. The Lucky Lady symbol acts as a wild and doubles any winning combination it is part of, which gives the base game slightly more impact compared to similar titles.
The main feature is triggered by landing three or more scatter symbols, which awards 15 free spins. During this bonus round, all wins are multiplied by x3, and the feature can be triggered again if the same symbols appear.
What makes this game stand out is the Extra Bet option, available in certain versions. When activated, it introduces an additional reel, increasing both the bet size and the number of possible combinations. This also affects how wins are calculated during free spins, making the bonus round more dynamic compared to the standard version.
In practice, the game follows a familiar pattern where most of the value comes from free spins, but the combination of a doubling wild and a consistent multiplier gives it a slightly different balance compared to other Greentube slots.
Theme: Fantasy, luck based symbols
Volatility: Medium
RTP: Around 95%–96% depending on the casino
Max Win: 27.000x
Book of Ra Deluxe is the most recognizable slot associated with Greentube and Novomatic. The game has been present in casino environments for many years and remains one of the most widely known titles in their portfolio.
The structure is simple. Wins are formed from left to right across active paylines, while the Book symbol acts both as a wild and as a scatter. Landing three or more Book symbols anywhere on the reels triggers the bonus feature.
The main feature consists of 10 free spins, where one symbol is randomly selected to become the expanding symbol. When this symbol appears on a reel, it expands to cover the full reel height, creating multiple winning combinations at once.
This mechanic defines the entire gameplay. Most of the value comes from how often the expanding symbol connects during free spins, while the base game mainly serves as a build up to the bonus round.
Over the years, the game has been released in multiple versions and variations, each keeping the same core structure with small adjustments in layout, paylines, or additional options.
What makes this slot stand out is not complexity, but consistency. The rules are easy to follow, and the feature behaves in a predictable way, which is one of the reasons it has remained relevant for such a long time.
Theme: Egypt, exploration
Volatility: Medium-High
RTP: Around 95%–96% depending on the version and casino
Max Win: 5000x
Simply, Book of Ra is the OG of the Book, Book, Book, slots type.
Greentube slots follow a very consistent structure that comes directly from their original versions. Most games use simple reel setups, familiar symbol layouts, and straightforward bonus mechanics.
In many titles, the main feature is based on free spins with expanding symbols, where one symbol is selected to cover entire reels during the bonus. This mechanic appears in several of their well known games and plays a central role in how wins are built.
Another common element is the gamble feature, where players can choose to risk a win by guessing the color of a card. This option is not unique to Greentube, but it is present in many of their slots and closely tied to their traditional design.
Visually, the games tend to keep a simple and recognizable style, without complex animations or layered features. The pacing is steady, and the focus stays on the base game and bonus rounds rather than additional mechanics.
Overall, the design does not try to introduce new systems, but instead keeps the structure that players are already used to, especially those familiar with Novomatic titles.
Greentube is part of the Novomatic Group and serves as its digital division. After joining Novomatic in 2010, the company took over the role of bringing existing slot titles into the online space and developing new games based on the same structure.
A large part of Greentube’s work is focused on adapting well known Novomatic games for online platforms. This includes keeping the original mechanics, symbols, and bonus features, while making them accessible through modern casino websites.
In addition to game development, Greentube also provides content to licensed operators through its distribution network. This allows Novomatic titles to appear across a wide range of online casinos in regulated markets.
In simple terms, Greentube handles the online side of Novomatic’s slot portfolio.
In other words.. Greentube = Novomatic Online.
Greentube slots does not rely on marketing claims or frequent award promotions. Its position in the market comes mainly from its connection to Novomatic and the long history of its slot titles.
Many of its games are still widely available in regulated online and land based casinos, especially across European markets. Titles like Book of Ra, Lucky Lady’s Charm, and Sizzling Hot continue to appear on multiple platforms, which reflects their long term presence rather than short term popularity.
Instead of focusing on new trends, Greentube remains consistent with the same style of games that players have known for years.
Greentube slots are recognizable all over the world, especially in Europe where there are still casinos with older machines. Many people don’t know the difference between Novomatic and Greentube, so I’ll explain it in simple terms.
Novomatic is the “Father” (the boss). It’s a large Austrian company that has existed for decades. They focus on physical machines, the real slot machines you see in casinos, betting shops, and slot clubs. When you walk into a venue and see a Gaminator machine, that’s probably Novomatic.
Greentube is the “Son” (the online division). It is part of the Novomatic group, but focused only on the online world.
Their job is to take legendary games from Novomatic machines like Book of Ra, Lucky Lady’s Charm, and Dolphin’s Pearl, and bring them into a digital format so you can play them on your phone or computer.
The main differences in 3 points:
Where you play: Novomatic is in physical venues (offline), Greentube is on websites and apps (online).
Role: Novomatic builds the machines and creates the original game math. Greentube develops the software that runs those games online.
Branding: In online casinos you will often see “Novomatic”, but if you look closely when the game loads, you will see the Greentube logo. They are basically Novomatic Interactive.
In simple terms: Novomatic is the factory that created the game, and Greentube is the one that brings that same game to your mobile or PC.
When it comes to personal experience, I sometimes like to play these games in a land based casino, never online. It’s that feeling when you leave the house, order a coffee in the casino, and just calmly spin a slot. Then it’s usually Book of Ra or Golden Ark. I never won anything big, so I would say these games feel medium in volatility. Max win is unknown because it depends on the casino.
What’s interesting is that Book of Ra is one of the most popular slots ever and it has 18 versions, no other game really comes close, maybe Big Bass Bonanza from Pragmatic Play, but the rest are not even close.
If you are a fan of retro style and a slower pace, then Greentube is a good choice.
Greentube is not focused on introducing new mechanics or complex systems. Instead, it continues to build on a style that has been present in Novomatic games for years.
Most of its slots follow a familiar structure, with simple layouts and bonus features that are easy to understand. For players who are used to this type of gameplay, that consistency is the main reason these games are still relevant.
Greentube slots are not trying to compete with modern feature heavy releases. Their value comes from keeping a format that many players already know and prefer.
Greentube slots deliver exactly that — straight from the Novomatic vault.
📎 Official site: https://www.greentube.com
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