Many changes were made to the game as it traveled across borders, resulting in the wide variety of rummy variations that exist today. Rummy had arrived in the US by the late 1800s, where it quickly became very popular, especially among families and social circles. Rummy startetypes of expansion slotsd to borrow features from other card games as it developed, which improved the gameplay even more. Players were able to make increasingly intricate combinations when the joker card was introduced in the early 20th century, adding a new level of strategy & excitement. High-stakes rummy games at gambling establishments drew serious players, proving that the game's appeal extended beyond casual play. Rummy had become a popular game in many cultures by the middle of the 20th century, which prompted the creation of a wide range of regional variations.