Planet of the Feebs was originally developed at the beginning of the nineties[?] by Scott Falhman, Skef Wholey and others at Carnegie-Mellon University, and it was placed in the public domain. In 1998 Fred Gilham modified the graphics routines to work with X11. His patched version is available as a compressed archive, and the source code and documentation may also be browsed online.
Note: The documentation of Planet of the Feebs erroneously credits Xerox PARC researchers for "Maze War". Actually this game was was first written for the Imlac PDS-1 at the abovementioned location, then taken to MIT by Greg Thompson, where it was rewritten for the Xerox Alto and subsequently sent to Xerox PARC.