Tetris

Tetris is a tile-matching video game created by Russian software engineer Alexey Pajitnov in 1984. It has been published by several companies, most prominently during a dispute over the appropriation of the rights in the late 1980s. 

Right. I copied that stuff from Google. 

This is my way of saying it:

This game is called Tetris. The blocks fall down the screen and you need to use them to fill the screen. It's pretty challenging.