What I find interesting about the game is that the optimal strategy forces you to look for linear patterns early and then shift to nonlinear patterns later in each round. It’s a very mathematical game, and the cards are functionally equivalent to unique 4-digit base three numbers. (Don’t tell the kids that, or it won’t be fun any more.)
Full disclosure: I just like the game, and so do my kids. I have received nothing for mentioning here, but it could be of value to parents and grandparents.