Star Trek is a text-based computer game that puts the player in command of the USS Enterprise on a mission to hunt down and destroy an invading fleet of Klingon warships. Written in BASIC, it was widely distributed and ported for many minicomputer and mainframe systems. This was aided with the publication of 101 BASIC Games, which included the most widely played version, Super Star Trek. This version was relatively easy to port to Microsoft BASIC, and appeared on many of the early microcomputers in the late 1970s. This version was included in BASIC Computer Games, propelling it to become the first million-selling computer book. Due to availability of the source code this version was ported to practically every home computer system of the era.