They are awarded through a wheel feature, also available through the Hold and Spin. The game is in 50 credit betting increments the progressives are the same across the bet levels in a denomination, so your chances of winning the prizes/progressives are higher with a bigger bet. The version I played had a Tiger and Phoenix set of themes there are others that work a bit differently, so this is focused on those themes. But I did have multiple sessions on Ultra Rush Gold during my recent cruise, one of their games with their version of a Hold and Spin bonus.
I rarely write about Incredible Technologies games – for whatever reason they all feel a bit same-y to me.