Dig Dug is just weird, you have to use an air pump to inflate enemies until they explode. You press your button, shoot out an air hose, and then wail on the button to keep on inflating whatever helpless creature you stab with it.
But, in the heat of battle, you might really wish that you could pop those baddies faster.
Good news for you, then.
When you're pumping up something and then press a direction on the joystick, you start moving, but the enemy that you pumped up stays pumped up... for a while. You can then throw out another line and give it another pump. Then move, then pump.
Even easier, if you just walk toward the creature while tossing out air hoses, you just kind of pop them in record time.
And it's not even that gross to watch.