Ok gang, one more DIY Pong project – “The system plays a two players game which can be varied in several ways. The most common variant is the inversion of one of the paddles, giving a vertical line with a hole. Then, the system can let a paddle (or hole) wobble to make the games more difficult. Then, it is possible to add an “interraction” so that when a player moves his paddle or hole, the other player’s paddle or hole moves a little. By combining these options, a total of 32 variants can be obtained, and this does not include the extra variants made by placing one or two holes at specific locations. Here again, this article shows how it is possible to make “variable” games using a few chips.” – Link.