Space Fighter 2000

This is one of the many ZZT games which were provided as shareware, with the registered version available upon paying a fee (an offer rarely taken up) to the author.

This is also one of the many ZZT games using Super Lock, a locking technique which blocks some ways of browsing through boards in the editor at the cost of corrupting the final board.

Unfortunately for the author's budget, the final board of this game happened to be the board containing the information necessary to contact the author and register the game - making accessing this information not possible through ZZT alone.