If this is an attempt to get me to reveal my age, it has succeeded
One of my earliest game was in those "Game & Watch" gadgets that only have one game in it, like Donkey Kong, Hello Kitty and what not.
On the PC, I played Pacman, which came in one of those 5.5 inch floppy discs that actually flopped. The colorful little ghosts were among the most "terrifying" enemies I've met in my entire gaming life. There's also Digger, Tetris and Alley Cat (the bulldogs were pretty badass, despite their lack of pixels). LodeRunner was one of my favourites too.
On the consoles, there was Mario Bros, Ice Climber, Contra, Kungfu, Bomberman, Street Fighter - there's too many but these are what I can name off the top of my head.