Terra Probe is a single player, shareware, Boulder Dash type of game.

The player controls a probe which tunnels through the earth creating a tunnel wherever it goes. The object of the game is to collect all the diamonds to complete the level while avoiding falling rocks, mining droids that hunt the player down, and of course not getting trapped.
In addition to the basic hazards the player will also encounter pressure crushers that will turn boulders into gems, explosives, lasers, and cave creatures. Once a level has been cleared a vortex appears which transports the player to the next level.

The game is entirely keyboard controlled.