Well, I've gotten my first Mission that I don't think I'll be able to do (not counting the ones where I didn't have the required emoji): combo star+star 2 times in one game! I can sometimes get one, but I've not even gotten close to getting two yet! Not quite ready to spend the 20 gems to swap it, but I'm getting close to that point.
I haven't unlocked all of the emojis yet, but so far, the ones that clear emojis have been the most useful for me. I'm having trouble figuring out how to use Sebastian and Nick Wilde very effectively. Level 1 Sebastian just doesn't seem to last long enough to really be a score booster and Nick Wilde's skill doesn't seem to be very helpful unless you're having trouble finding matches on the board. Anyone have tips on how to use either of these more effectively?