The Hounds of Hell slot game has 8 bonus features. With Cascades for continuous wins, it’s all about Hellhound symbols which spread upwards to award adding or multiplying bet multipliers that are added and awarded at the top of the column. With Roaring Packs, there are 2 free spins features which offer increase chances of landing Hellhounds and Hell Reels which guaranteed Hellhound symbols on every free spin.
Cascades
When you land a winning outcome (6 or more matching symbols anywhere on the grid), the Cascade feature is activated. The winning symbols disappear with the remaining symbols falling down to occupy the empty positions. New symbols then fall in to hopefully give you another winning outcome.
Hellhounds

Look out for Hellhound symbols which are bet multiplier prizes. With only 1 Hellhound symbol appearing on a column at a time, they spread and are collected before being multiplied by your bet. At the end of each spin, Hellhound symbols spread to the top of their respective column: they then display a multiplier value.
All multipliers are collected bottom-to-top, left-to-right, and displayed above each corresponding column. The bet multiplier values above each column are added together and multiply your bet to determine your final win. However, there are 2 types of Hellhound symbols:
- Adding Hellhound Symbols: Added to the current total at the top of the reel, values range from 1 to 50x.
- Multiplying Hellhound Symbols: Multiplying the current total at the top of the reel, values range from 2x to 10x.
Roaring Packs of Hell
When 2 or more Hellhound symbols appear on adjacent columns and on the same row, they form a Roaring Pack with their possible bet multiplier values increased. Hellhound symbols that spread from a Hellhound that is part of a Roaring Pack are also counted as pack of the pack.
Below are the possible bet multiplier values that can appear on Hellhound symbols that are part of a Roaring Pack:
- Adding Hellhound Symbols: 5 to 100 x bet
- Multiplying Hellhound Symbols: 3 to 20 x bet
If a Hellhound symbol has been part of a Roaring Pack, it remains part of the pack even if it is separated and ends up on a different row due to winning symbol cascades.
Hounds are Loose
The Hounds are Loose feature is triggered randomly on a spin once the grid is settled with no new Scatter Pays wins formed. When it triggers, all low-value royal symbols are removed with new symbols dropping in to fill the grid. With the possibility of activating multiple times per spin, there is a higher chance of Hellhound symbols appearing.
Bonus Gamble
When you trigger a bonus feature, you have the choice to play the feature or gamble. If you opt to gamble, you will pick from 5 Hellfire Orbs. Choosing up to 3 Hellfire Orbs, each Hellfire Orb contains between 2 and 10 free spins or a Bonus Upgrade is you land the What the Hell! Bonus feature. This will activate the Who Let the Hounds Out?!? Bonus feature with 10 free spins.
What The Hell!
Hounds of Hell comes with a What the Hell! Bonus feature. It’s activated by landing 3 FS Scatter symbols simultaneously during a base game spin. Using the same mechanics as the base game, all Hellhound bet multiplier values are kept above the columns until the end of the feature. Once the feature ends, all collected bet multiplier values are added together are awarded.
Furthermore, the Hounds are Loose feature is guaranteed to trigger after 3 non-winning free spins in a row. A non-winning free spin one is that has no standard symbol wins or without Hellhound symbols. Landing 2 or 3 FS Scatter symbols will reard you with 2 or 4 extra free spins, infinitely.
Who Let The Hounds Out?!?

The Who Let the Hounds Out?!? Bonus feature is triggered by landing 4 FS Scatter symbols during a base game spin. With 10 free spins awarded, it plays out like the base game but there are persistent Hell Reels. You’ll also benefit from a more lucrive Hounds are Loose feature.
When a Hellhound symbol lands on a column for the first time, that reel transforms into an activated Hell Reel. Basically, a Hellhound symbol is guaranteed to land on each activated Hell Reel on every free spin.
Unlike the base game, Hellhound bet multipliers are added together and paid at the end of each free spin with the total bet multipliers above each reel reset to 0 between free spins. Finally, landing 2 or 3 FS Scatter symbols will reward you with 2 or 4 extra free spins.
Bonus Buy
As expect, non-UK players can opt for the Bonus Buy feature in the Hounds of Hell slot game. With 4 options, below is a table highlighting all the details as well as the RTP rate (for the highest RTP setting):
Feature | Description | Cost | RTP Rate |
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BonusHunt Featurespins | 5 x more likely to trigger a bonus feature | 3 x bet | 96.24% |
Howling FeatureSpins | Guaranteed 3+ Hellhound symbols | 60 x bet | 96.24% |
What the Hell! | 10 free spins | 100 x bet | 96.18% |
Who Let the Hounds Out?!? | 10 free spins | 250 x bet | 96.26% |