5. "Tetris"

Release date: June 6, 1984

Platform: Various consoles

Buy it here.

"Tetris," the game in which you manipulate falling blocks to create lines that are then cleared from the screen, turned 30 years old this year. 

The story behind "Tetris" is complicated, but the game is fun and hugely addicting. And who can forget the music?

It was released with the Game Boy handheld gaming system and turned the Game Boy into the most popular portable gaming system of its time. Since then, it has become one of the top-selling games of all time. It's so beloved, in fact, that a movie trilogy will be based on it.