Ball was the first ever Game and Watch game, ever.
In the game, Mr. GAW had to juggle balls by moving left to right. In Game A, there are two balls, but in Game B(not Gameboy)there are three balls, therefore making the game harder.
Super Smash Bros. Edit
In the Smash Bros. series, Mr. GAW's grab are all balls. There's a trick to it, however. The forward, backward, up throws are slightly stronger than the down throw.