Enter at the password screen. The characters go from top left, top middle, top right, center left, center, center right, bottom left, bottom middle, bottom right ...

At least Tom got the girl in the end - maybe they were ... him for his many years of persecuting the little mouse.

The cat wasn’t yet named Tom. The mouse wasn’t yet named Jerry. And the cat-and-mouse chase storyline wasn’t intended to be followed by a series of cartoons featuring the both of ’em.