Pac-Man for the Atari 2600 was produced in the year of 1981 by Atari Inc. game developer, Tod Frye, who was given limited time to work on the game because since it was late 1981 it was going to be released in March of 1982 and it needed to be done soon. It sold exactly 7 million copies as the best selling Atari 2600 game of all time, but lots of buyers returned it because it was not at all like the arcade version. It was also blamed for the North American video game crash of 1983. It was followed by ports of Pac-Man's arcade sequels that included Ms. Pac-Man and Jr. Pac-Man. One of the bad graphics were the flickering ghosts. That was caused by the system having limited memory space, so only one ghost could fully appear at one time.