2. Pong
This game founded by the originator of Atari, Nolan Bushnell, was released in 1972. Actually, this simple table-tennis concept was rejected by the industry and Bushnell installed his machine in a California bar. He got a call later that week stating that the machine was broken; in fact, it was overflowing with coins.
Bouncing a small white ball between two paddles was an idea that took the world by storm. Atari manufactured the games on its own and soon video arcades were born.