With 8 bonus features, the Strength of Hercules slot is all about RotoGrid symbols. Causing the grid to rotate, this allows for new winning combinations and Connecting Wilds to appear. With Hercules randomly replacing a low-value symbol with Wilds, there are 4 free spins features. 2 of them offer more frequently RotoGrid and Wilds whilst the Labyrinth features come with new symbols where you aim to collect Coins at the bottom of the grid in reel meters.
RotoGrid

When you land a RotoGrid symbol, they become active after winning combinations take place. They grant 1 to 3 clockwise grid rotations that are collected in a meter outside the grid. Finally, the RotoGrid symbol transforms into a Wild symbol.
Every grid rotation sees the grid turn a quarter turn clockwise which gives you the possibility of new winning combinations being formed. Each rotation is awarded one at a time, with new wins processing before the next rotation.
If several RotoGrid symbols appear simultaneously, they activate one at a time. Up to 3 RotoGrid symbols can land on each spin at once.
Connecting Wilds
With every grid rotation, any Wild symbols that appear on the same reel connect: they then fill all positions between them with extra Wild symbols. If the grid rotates again, all Wild symbols can connect with other Wild symbols on their respective reels. This can lead to the grid being filled with Wilds.
Might of Hercules
When the current grid has stopped, there is a chance that Hercules can hit the grid with his club or fist. If this happens, the Might of Hercules feature activates with all instances of a randomly chosen low-value symbol being replaced with Wild symbols.
Bonus Choice

The Strength of Hercules slot comes with a Bonus Choice menu which is triggered when you land 3 or 4 FS Scatter symbols simultaneously during a base game spin. The choices are as follows:
- 3 FS Scatters: choose between the Labors or Labyrinth Bonus Game features
- 4 FS Scatters: choose between the Godly Labors or Godly Labyrinth Bonus Game features
Labors Bonus Game
The Labors Bonus Game feature begins with 10 free spins. It works like the base game but with a higher chance of RotoGrid and Wild symbols landing. If you land 2 or 3 FS Scatters, you’ll get 2 or 4 extra free spins respectively.
Godly Labors Bonus Game
The Godly Labors Bonus Game feature is the same as the Labors Bonus Game feature but with more frequent RotoGrid and Wild symbols appearing.
Labyrinth Bonus Game

When you opt for the Labyrinth Bonus Game feature, you begin with 8 free spins. Only the following symbols appear:
- Skull Block: non-paying
- Cracked Stone: non-paying
- FS Scatter: Award 1 extra free spin
- Adding Coin: Contain bet multiplier values between 1-100x
- Multiplying Coin: Contain 2-20x multipliers
The aim of the feature is to collect Coin and FS Scatter symbols in the Treasure Chests at the bottom of the grid.
When a Coin or FS Scatter symbol lands above a Cracked Stone symbol, the Cracked Stone symbol is crushed and disappears from view which lets the Coin or FS Scatter symbol move down into its position. This process is repeated until a Skull Block symbol gets in the way or the Coin or FS Scatter reaches the bottom row (which sees them collected in the Treasure Chest for that reel).
Each Treasure Chest comes with a progressive multiplier which is paid out at the end of the feature. Collected Coin symbols will either add their value to the existing Treasure Chest value or multiply the existing Treasure Chest value.
Once all Coin and FS Scatter symbols have moved as far as they possibly can, the grid may rotate either clockwise or anti-clockwise. When the grid rotates, Coin and FS Scatter symbols may move to a new position by breaking down Cracked Stone symbols. This moves them through the labyrinth of Skull Block symbols to the bottom of the grid.
Look out for the Might of Hercules feature triggering as a number of Skull Block symbols will be destroyed with a random number of Cracked Stone symbols shattered to uncover extra Coin or FS Scatter symbols.
Godly Labyrinth Bonus Game
If you choose the Godly Labyrinth Bonus Game feature, you will get 10 free spins. It works exactly like the Labyrinth Bonus Game feature but the Coins contain higher values and land more frequently.
Bonus Buy
Players located outside the UK can make use of the Bonus Buy feature. There are 5 options with all the details specified below in the table. They include the RTP rate for the highest RTP version too.
Feature | Description | Cost | RTP Rate |
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BonusHunt Featurespins | 5 x more likely to trigger a bonus feature | 3 x bet | 96.28% |
RotoGrid FeatureSpins | 1+ RotoGrid + 2 Wild symbols will land | 60 x bet | 96.3% |
Extreme RotoGrid FeatureSpins | 1+ RotoGrid symbol will land | 60 x bet | 96.3% |
Strength Is My Legacy | Labors or Labyrinth Bonus Game feature | 100 x bet | 96.31-96.28% |
Victory Is My Destiny | Godly Labors or Godly Labyrinth Bonus Game feature | 200 x bet | 96.29-96.26% |