34x on Leo Vegas
Well, this is a super volatile game which I've only played a few times due to the playing and not getting anywhere on my normal stake and not upgrading. The concept is interesting with the levelling system using the "Jack" symbol, which not only makes achieving a bonus but getting a good win possible. Not tried the multiplier option yet but seen it in effect watching the "LetsGiveItASpin" boys and it looks like it just burns balance, but hey it's something different.
The graphics are simple and work really well on Mobile and Desktop. The Music does capture a gentleman's theme quite well also.
Overall, I give Generous Jack 8/10