A lot of people talking about the arcade component, but Tetris was the original shareware. It was a phenomena that spread through the USSR until it touched a British entrepreneur. It didn’t even keep score originally.

Tetris 99. It’s like racing side by side with 98 other Sisyphuses to see who can get their boulder up the hill most efficiently.

Weren’t high score games a staple of arcades long before tetris?

The original roguelike