The difficulty curve primarily comes in the form of your assists being gradually diminished over the course of the career, rather than simply from the AI playing better. As such playing the game becomes increasingly irritating the further you get, and I personally found myself stonewalled on one event in particular- it takes place on a pink table where the objective was simply to pocket three balls in as few shots as possible.

It's a shame too because aside from this one snag Hustle Kings was overall a really smooth take on pool, touch controls and all.