Hollow Ground is a one or two - player tactical arcade game taking place in a post - apocalyptic future. Four mercenaries have to make an unwelcome journey to rid a war - weary world of a new threat of extinction, a terrible biomechanical weapon of mass destruction. On the way you have to battle armies of mutated creatures while navigating through the labyrinthine tunnels of the Epsilon bunker. You will find weapons to aid your quest, and credit chips for use in the shops that appear between levels. The more than 60 maps appear in a somewhat random order to enhance re - playability. The blend of old - school arcade action and true focus on tactics is what sets this game apart from an ordinary shooter.