The logical option would be to reduce the
size of the game
screen so there is some sort of button bar, but at the same time you really don't want to make an
already small screen even
smaller.
If you
already have an Air 2, then you have to seriously want to switch to the
smaller size, and if you have a mini 3, you have to seriously want the better
screen and / or camera, for the iPad mini 4 to make any sense.