This game contains one of the earliest examples of a videogame Easter egg. The programmer hid his last name in the game. This Easter egg is thought to have even predated the more well known one found in the Atari 2600 game Adventure.
See the tips and tricks section of this game entry to learn how to find this Easter egg.
Also off note, the programmer also hid his daughter's name, Tracy, in the last five bytes of software code. Add