The history of rummy is long and illustrious, having begun in the early 1800s. Its beginnings are a little unclear, but some theories contend that it might have developed from earlier card games like Conquian, which is thought to havecats slots originated in Mexico. Due to the many changes that rummy has experienced over time, different regional and international variations have emerged. Differences by Region and Gameplay Mechanisms. The rules and gameplay mechanics of each variation of rummy, from Indian to Gin, vary depending on the cultural influences of the areas in which they were first made popular. Rummy evolved to accommodate regional tastes and gaming styles as it expanded throughout the world.