It is a wonderfully challenging, difficult game. I must admit that I once played a single game on Robotron for about 32 hours. My score was over 127,000,000 points - it was a 'world record' score for a while during the arcade era. Found one overflow bug - too many extra men and it rolls over to >>zero extra guys (8 bit overflow). Pretty much a panic situation after playing about 20 hours.
I now own one and have it in the game room in the the basement (next to my Asteriods machine). Still a lot of fun to play, even if I only play for an hour or two.