The object of the game is to, for as long as possible, not die.
Upon starting the game, you are placed in the center a randomly generated slightly hilly area. Enemies, few at first but steadily increasing in numbers and frequency, will attempt to reach you at the center of the playfield, and if they do so you will die.
To prevent them from killing you, you are provided a choice of five upgradable weapons to fend them off.
After a brief period of fending off enemies successfully, the level will end with a tally of kills, and then generate a new level with larger hills and begin sending larger waves of more enemies.