I thought it looked very similar to Dark Waters mechanics too having played it a few months ago

I think FS packages in general should let you choose ie 100fs @ 20c or 20fs @ $1. Gamble would be degen too but possibly worthless with wincaps being low on many casinos.

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My first impression is that the green and red chest are triggering some kind of bonus round (one is a jackpot feature and the other mystery bonus?) The coin pile on the right means that you will get a random coin win.