One Piece: Unlimited Cruise 1 - The Treasure Beneath the Waves is an action adventure game based on the One Piece anime and manga series. It follows the Straw Hat crew as they embark on a journey to visit four islands, each with its own ordeals that Luffy must face to receive a reward. Along the way, they are accompanied by a strange creature named Gabri.
Players control each member of the Straw Hat crew, including Monkey D. Luffy, Roronoa Zoro, and others, as they explore various islands and battle enemies. The game features a mix of exploration, crafting, and combat, allowing players to collect items, fish, insects, and break rocks using different tools. With the goal of progressing through each island, players must navigate challenges and overcome obstacles.