RYUKYU is a 1990 puzzle game where players strategically select and place cards from their hand onto a grid to form poker hands in vertical, horizontal, or diagonal lines. The objective is to maximize scoring by creating the strongest possible poker combinations across the board. The game features a mysterious element involving the Ryukyu card placement in the center square, which unlocks special content upon game completion. This arcade re-release includes the series' standard features such as adjustable difficulty settings and authentic arcade display options.