Montalago and Planetary Travel are among the first games that I ever created (1983-1985 or thereabouts.) During Middle School my father purchased a Franklin Ace computer (Apple II compatible). With the help of a few simplistic BASIC books and my own ambition, I soon began to program my own games.
Montalago was a first-person dungeon and dragons style game featuring, believe it or not, GR graphics.
Planetary Travel was an interplanetary trading game. It was text-based but it featured a much more sophisticated game engine than Montalago.