There's currently four sub-games - the other two aren't ready to show but I'll write I think six more before I'm done
Looks very nice, and I love the idea of 10 sub-games (it is 10, right, or have I misunderstood?), and that would make me purchase this rather than the myriad of other match-whatever games available.
Maybe you could have it so that you had to somehow earn (unlock) a few of the sub-games, by achieving something special in the main game?