Greentube launches Highway to Bell Stack & Collect as a new online slot

Greentube has launched Highway to Bell Stack & Collect™, bringing a new Hell-Rock themed online slot to its B2B portfolio. The NOVOMATIC Digital Gaming and Entertainment division lists the title as its latest release, with five reels, 20 win lines and a feature set centered on Fireball symbols and bell-based collection mechanics. Greentube’s official product announcement confirms that the game became available to B2B partners on 22 September 2026.

The release follows the title’s earlier presentation as an upcoming game at iGB L!VE 2026 in London. Greentube had described it as a major Q3 release and highlighted its rock-inspired theme alongside Bell Collect, Mystery Bell Collect and the Stack & Collect™ Bonus before the launch date was reached.

A Hell-Rock theme built around collection mechanics

Highway to Bell Stack & Collect™ uses a concert-inspired Hell-Rock setting to frame its gameplay. Fireballs carry monetary values while the Bell Collector and giant bell form the central collection elements. The design connects the visual identity of the game with its principal features.

When Fireball symbols land alongside the Bell Collector, the Bell Collect feature activates. The values attached to the visible Fireballs are gathered and combined before the resulting amount is awarded. This gives the base game a clear collection mechanism that is directly linked to the symbols appearing on the reels.

A second route is provided through Mystery Bell Collect. If Fireballs land without the Bell Collector, Greentube states that the Mystery Bell Collect can activate randomly. The Fireball values are then directed toward a large bell positioned outside the reels, which can collect the displayed values.

How the Stack & Collect bonus works

The main bonus feature is triggered by three microphone symbols landing on reels 1, 3 and 5. Once triggered, the Stack & Collect™ Bonus starts with three free spins. The feature is designed around keeping the sequence active while increasing the values represented by Fireballs.

New Fireball or Incrementer symbols can reset the free-spin count. Incrementer symbols also increase the values of all visible Fireballs before transforming into Fireballs themselves. This creates a progression system in which new symbols can affect values already present on the reels.

The bonus advances further when a reel is filled with Fireballs. The bell above that reel then collects the values and increases its multiplier, with the multiplier able to reach 3x. Greentube states that each reel can be collected up to three times before it locks.

A release structured for B2B distribution

Greentube’s current product communication presents Highway to Bell Stack & Collect™ as a title for its B2B partners. The company also states that a Buy Bonus option is included under certain licences, allowing the relevant feature to be entered directly where permitted.

That qualification is important because online casino content is distributed according to the licensing and market conditions applicable to each jurisdiction. Greentube’s published corporate information identifies regulation in Great Britain and licensing in Malta. The UK Gambling Commission public register lists Greentube GmbH under account number 41020 while Malta Gaming Authority records identify Greentube Malta Limited as licensed.

The company’s website describes Greentube as the NOVOMATIC Digital Gaming and Entertainment division and states that it provides casino entertainment to players internationally.

Richard Ganster comments on the release

Richard Ganster, Director of Games Strategy and Games Portfolio Management at Greentube, is quoted in the release. His current role is also reflected in Greentube’s published editorial material.

He said: “Highway to Bell Stack & Collect™ takes players to a rock concert in Hell and every element of the game is built around that energy. The Bell Collect and Mystery Bell Collect keep the base game rewarding on every spin, so players always have something to watch for.

“The Stack & Collect™ Bonus is where the title really delivers. Locking in fireball values, reel by reel and pushing toward the Grand Prize give players a clear sense of progression and a strong ceiling on win potential. It's a title that fits operators looking for a hard-rocking hit with genuine depth to its feature set.”

The remarks describe the intended relationship between the title’s theme and its collection mechanics. Fireball values remain central from the base game into the bonus while the bell system provides the principal collection mechanism.

The game adds another distinct theme to the portfolio

Highway to Bell Stack & Collect™ adds a different visual setting to a 2026 release programme that has also included established Greentube families such as Piggy Prizes™, Cash Connection™ and Starlight Jackpots™. The company has continued to develop recognisable game families while introducing new concepts and themes.

In this release, the rock-concert setting is closely integrated with the feature design. The Bell Collect mechanic handles Fireball values in the base game, Mystery Bell Collect provides a random alternative collection route and the Stack & Collect™ Bonus expands the same concept into a longer progression feature.

For operators, the structure offers several clearly defined gameplay elements within one title. The base game introduces the collection concept, the mystery feature creates an alternative trigger and the bonus phase adds resets, Incrementers and reel-level multipliers. Greentube’s official materials also confirm that the game is now available to B2B partners.

Conclusion

Highway to Bell Stack & Collect™ marks another addition to Greentube’s online casino portfolio with its 22 September 2026 launch. The title combines five reels and 20 win lines with Bell Collect, Mystery Bell Collect and the Stack & Collect™ Bonus in a Hell-Rock setting.

Its design places Fireball values at the centre of both standard play and the bonus sequence. Collect features establish the main framework while Incrementers, free-spin resets and reel multipliers add further layers to the bonus. The Buy Bonus option is also available under certain licences.

The release gives Greentube another feature-led title for its B2B partners while maintaining the company’s wider focus on distinctive themes and structured game mechanics. Availability and individual features remain subject to applicable licensing conditions and market requirements.

FAQs

What is Highway to Bell Stack & Collect?
Highway to Bell Stack & Collect™ is an online slot developed by Greentube and released for the company’s B2B partners on 22 September 2026.

Who developed Highway to Bell Stack & Collect?
The game was developed and released by Greentube, the NOVOMATIC Digital Gaming and Entertainment division.

How many reels does the game have?
Highway to Bell Stack & Collect™ features five reels with 20 win lines according to Greentube’s official product information.

What is the Bell Collect feature?
Bell Collect activates when Fireball symbols land alongside the Bell Collector. The values of the relevant Fireballs are collected and combined before the resulting amount is awarded.

What is Mystery Bell Collect?
Mystery Bell Collect is an alternative collection feature that can activate randomly when Fireballs land without the Bell Collector. The values are directed toward a large bell outside the reels for collection.

How is the Stack & Collect Bonus triggered?
The Stack & Collect™ Bonus is triggered by three microphone symbols landing on reels 1, 3 and 5.

How many free spins start the bonus?
The Stack & Collect™ Bonus begins with three free spins. New Fireball or Incrementer symbols can reset the free-spin count.

What do Incrementer symbols do?
Incrementer symbols increase the values of all visible Fireballs before transforming into Fireballs themselves during the bonus.

Can reels receive multipliers in the bonus?
Yes. When a reel is filled with Fireballs, the bell above that reel collects the values and increases its multiplier, which can reach 3x. Each reel can be collected up to three times before locking.

Is a Buy Bonus option available?
Greentube states that the Buy Bonus option is available under certain licences. Its availability therefore depends on the applicable licensing and market conditions.