Those are the 2 Nova buttons & they do work. You have to have a hatch open to fire or catch it. The only thing I've noticed is with multiple key presses, you can open hatches on the the other players grid. Don't know if you can do that in the original cabinet or not.
My only question is, what is the static like discharge across the screen when you hit multiple hatches at the same time?
Pessimist: Oh, this can't get any worse!
Optimist: Yes, it can!