The currently active symbols that can interact and produce wins combined with the Jumbo wild symbol start with the Green and Blue flower symbols. This novel feature can be somewhat confusing until you understand the starting symbols that are active when combined with the Wild Potato are very limited.
Scoring wins with the highlighted symbols illuminates then on the collection meter, when all of these symbols types have been collected, several things occur.
The Potato grows in size, creating more wilds for the remainder of the bonus. Extra spins are awarded for finishing that level (+3). More symbols become unlocked in the collection meter to be collected for this process to repeat.
This whole system can be pretty confusing until you realise the cumulative unlocking and increasing potential that this machine possesses once a good round occurs.
The dream goal is to reach the final level of the bonus round, which sees the Wild Potato grow so large that it covers the entire reel set and awards the highest paying King Potato symbol on every free spin left.
Factor in that the Superspinner feature is also active during the bonus round and can multiply these wins to even greater levels.
There is a bonus buy feature for players from countries that still allow this feature to trigger the Free Spins Round instantly at a cost dependent on the current bet level.
In Royal Potato, the bonus buys cost is an unusual 93x Current Stake, factor in that this is a very high variance and volatile machine, so many outcomes from this bonus will be under the cost to buy it, of course, the flip side being some bonus rounds will exceed the cost up to a potential 30,000x stake win.
When using this feature, there are also some minimal differences in the slot RTP, with values increased to a very healthy RTP of 97.20%.