This has been rumored for years. I'm personally 99.9% convinced this is the real deal. The character designs and animations, background art, game functionality and overall polish and charm feel completely authentic to the G&W games Nintendo was putting out at the time. Game A is pretty much the same as regular Tetris though you move the blocks on the bottom so they can use less LCD segments. Game B gives you 60 seconds to get a Tetris (clear four lines at once) and then you move on to the next level. The game was supposedly titled "Tetris Jr." and would have been model TR-66.