What are some of the influential games in the history of video games?

What are some of the influential games in the history of video games?

Well, obviously Pong, Space Invaders, and Pac-Man are some of the influential games in the history of video games. I think that maybe the greatest single video game ever developed was Tetris. A very simple game visually, it could be played on anything; it could be played on a cell phone, it could be played on a Blackberry. There's no system I can think of with so little memory that it can't play Tetris in some form or another; and yet, it's a game that could not exist outside the virtual world. I mean, you couldn't; what would you do? Drop blocks into tanks of water or something? How would you manoeuvre those blocks around? It's something that would clearly be impossible to imagine in any form but an electronic form.