My favorite interaction in life is board games. The way they are made is so simple but there are rules that you have to follow. An example would be a game called “Munchkin”. The game is a tiny version of “Dungeons and Dragons”. The goal of the game is to reach lvl10 (or lvl20 in expansions).
The game is simple and complicated at the same time. You interact with it using a rolling dice and some coins and of course the cards.