Analysis of information sources in references of the Wikipedia article "History of video game consoles (first generation)" in Simple English language version.
Like Pong, Telstar could only play video tennis but it retailed at an inexpensive $50 that made it attractive to most families that were on a budget. Coleco managed to sell over a million units that year.
Nintendo entered the home market in Japan with the dramatic unveiling of Color TV Game 6, which played six versions of light tennis. It was followed by a more powerful sequel, Color TV Game 15. A million units of each were sold. The engineering team also came up with systems that played a more complex game, called "Blockbuster," as well as a racing game. Half a million units of these were sold.