QUICK NOTE: THE FLICKERING AND RANDOM DISAPPEARING OF OBJECTS IS THE RESULT OF CAPTURED EMULATION FOOTAGE AND ISN'T PRESENT IN THE ACTUAL GAME.
A new homebrew version of Mappy for the 2600 is currently in the works. This is a rom of the current beta. You can get a copy of this rom on Atariage to try yourself here:
http://atariage.com/forums/topic/2726...