Also known as the "Alea Card Game" series.
alea was started as a new label within Ravensburger Spieleverlag GmbH in 1999. Each of their games in a particular sized box is numbered in order of publication, yielding the Alea big box series, the Alea medium box series, the Alea small box series, and the Alea very small box series.
This fourth Alea series was introduced in January 2016 with card game variants of The Castles of Burgundy and Broom Service. In a very compact form, much fun is presented in a small package and for little money. The focus of this series will be set to originality and unusual mechanisms. More thorough standalone card and dice games in the series will be released in the years to follow. https://www.ravensburger.com/alea/aktuelles/index.html
Puerto Rico the card game (most recent version of San Juan) is #5 in the series