Trak

Trak is a 1-player arcade game for the TRS-80.

You play as a small character who must follow a series of tracks places on a level, while avoiding enemies. As the player moved, he converts the '+' track to '.'. The player gains points for travelling on '+' spaces, but loses points for travelling on '.' spaces. As the enemies moves about the screen, they replenish the track, allowing the player to gain more points. If the player is caught by a pursuing enemy, it's game over.