Games – who doesn’t like them? From our early childhood on we engage in playing. Some of the games have an educating purpose, such as a quiz or a strategy game, some are embedded in a physical activity and we call them sports, and some games we play for entertainment purposes in a social environment, for instance, in form of board or card games. One of the simplest and, hence, most popular games that not only children know how to play is Rock‑Paper‑Scissors (RPS). It is a game that only requires two things: A partner to play with and an empty hand. It can easily be played anywhere and any time, and it purely depends on luck – or does it not? And what use is this game for psychology?