Classic card game Rummy InBetween now available on App Stores. This game is also known as "Acey-Deucey" or "In-Between". Rummy InBetween is the modern mobile version of the classic card game, Acey Deucey. It was played in turn-of-the-century Kansas rail-yards, on riverboats along the Mississippi, and frontier-town saloons in California's old West.