Changes

The player in Tombstone City controls a spaceship referred to in the literature as a schooner. The object is to destroy a the primary target targets which are green aliens referred to in the manual as Morgs, and a secondary target targets which are purple tumbleweeds. The purpose of the game is to woo others back to live at an unnamed southwestern town in the United States by reducing the number of aliens and destroying these tumbleweeds. The score is labeled as "population in the game. The game is over when the player loses all his/her schooners. The player's schooner starts out in the center of sixteen blocks right in the middle of the screen. This structure of blocks represents a safe zone where the Morgs cannot enter and kill the player. The player can kill either Morgs or tumbleweeds within the range of the safe area of blocks, however, most of the targets will require the player to leave the safety of the blocks and venture outside, making the player much more vulnerable. Each tumbleweed destroyed earns the player 100 points of population. Each Morg earns 150 points.