I haven't played this game many times, but I saw many videos explaining the design of it. It's so brilliantly designed that changing the pieces of the game or adding to them can make it unplayable.

There is much to learn from it.

Tetris is one of the best games in the world, and it's almost certain that everyone has ever played it, as surely as everyone breathes air.

I can think of many people who haven't even touched it, but yeah the message is clear here.