The theoretical long term RTP for this game is 96.50%.

Game Rules

This game is played using Clusterbucks evaluation.
Winning combinations are defined as groups of matching symbols that are horizontally or vertically adjacent to one another.
Only the highest paying combination for each group is paid per spin.
Win combination pays are multiplied by the bet multiplier.
Scatter symbols award in any position on the reels.
All 9 reels are always in play.
Wins are shown in credits unless marked as currency.
Values displayed in the Help Screens have not been pre-multiplied, except where stated.
Wins subject to verification.
Malfunction voids all pays and plays.

Free Games Bonus

During the base game, 5 or 6  starts the Free Games Bonus.
5  awards 7 free games.
6  awards 10 free games.
 substitutes for 2  symbols.
 and  are scatter symbols.

The Free Games Bonus does not award additional free games.
The Free Games Bonus ends when 0 free games remain.

On each spin, there is a random chance that the non-wild symbols will become double symbols after they finish spinning
The centre position in the centre reel is locked wild and substitutes for all symbols.

RANDOM UPGRADES FEATURE

On each spin, there is a random chance that , , , and  symbols will become , , , and  on the reels after they finish spinning.