This is (unfortunately) very similar to Pac-Man in its somewhat basic approach. Mr. Dig must dig for hidden food supplies in the Meanies territory below ground. As he digs he can eat his way round cherry groves whilst being followed and attacked by the Meanies which can be crushed by dropping apples on them. Meanies can't dig tunnels or eat cherries, but watch out that they don't change into miners, which can do both. Every so often a fallen apple will split open and reveal a sparkling diamond - collecting this increases your score immensely.
Also introduced into the game are mallers (mallers?) and a letter monster. You can destroy the mallers individually, when they will mutate into apples, or they will disappear when the letter monster is destroyed. You can destroy opponents either by launching your power orb or by dropping apples on them!
There are nine levels of play from Baby to Masochist, so there should be a level to suit most people.