According to Wikipedia, the best selling video game is Tetris: it has sold approximately 170 000 000¹ copies. If copying Tetris takes 1 second, the computer draws 400 W of power and electricity is rated at 30 cents/kWh, it would cost approximately $5667 to create 170 million copies of Tetris.

¹ https://en.wikipedia.org/wiki/List_of_best-selling_video_gam...