D.N.A Warrior

User summary: A stage-selective shoot'em-up developped for the Commodore 64 in 1989. The player controls a miniature craft travelling through the blood vessels of a sick human being, trying to track down the disease and defeat it. At the end of each stage, there was a choice on where to go (up or down), and the player could also choose to reverse the scrolling and backtrack, making for a maze-like game.