Digger

Digger is a variant of the Namco arcade classic Dig Dug , You control a miner digging for treasure, but the mines are infested with monsters. These creatures can travel through the rock as transcorpeal beings, but appear in more solid form when they enter areas free from rock, such as the tunnels you dig. Your aim is to rid each level of all monsters.

Monsters can be killed in two ways. Firstly, a corporeal monster can be shot with your gun. But they are hardy beasts, and unless you shoot them four times in a row, they will soon recover. Also, for some reason, you can only shoot sideways. Secondly, monsters can be killed by bugs. Each level has three bug containers, and by removing the soil over the top of the container, you release the bug which immediately heads to the surface devouring all monsters (corporeal or otherwise) in its path. The bugs may also eat you too, so don't get in the way.

The levels continually increase in difficulty with the addition of more starting monsters (up to a max of 7) and increased speed, until eventually the monsters win.