Note: This procedure requires editing a game file; creating a backup copy of the file before proceeding is recommended. With a text editor, edit the "shellcfg.h" file in the "dark\shell\" directory. Change the "#define BTN_MISSION_COEFFICIENT 150" line to "#define BTN_MISSION_COEFFICIENT 157". The new "Cheat" icon in the lower left corner of the screen will allow any mission to be selected on the dial.
On the last mission, there is a monolith somewhere in the northwest corner of the map. After destroying all enemy forces and gathering a minimum of 100,000 credits, the Easter Egg will activate when you move any unit near the monolith.