Analysis of information sources in references of the Wikipedia article "Color TV-Game" in English language version.
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.
こうして任天堂は1977年に、価格9800円の「カラーテレビゲーム 6」と、価格1万5000円の「カラーテレビゲーム 15」を売り出すことになる。