From Pong-Story.com:  Still in 1975, Magnavox released an improved version of the Odyssey 100: the Odyssey 200. It was same as the Odyssey 100 but with two additional chips from Texas Instruments, which added a third game called SMASH and some on-screen scoring. The Odyssey 200 could be played by two or four players (first system to offer this feature), and displayed very basic on-screen scoring using small rectangles (it still had the two plastic cursors to record the scores). Each time a player marked a point, his white rectangle would shift on the right. The winner was obviously the first whose rectangle would reach the rightmost position on the screen. Although the scores were not yet digital, the Odyssey 200 remained more advanced than the first home version of Atari PONG because it played three different games for two or four players.