A new game mode called 'Titan mode' is introduced, where opponents are actually their size like being really small or being a giant from the anime, forcing the player to adjust their strategy. The game features game play similar to the previous installments. It is a sequel to the 2015 game One Piece: Pirate Warriors 3. It is the fourth installment in Pirate Warriors video-game series, based on the One Piece franchise. Game Review One Piece: Pirate Warriors 4a is an action-adventure video game developed by Omega Force (Koei Tecmo) and published by Bandai Namco Entertainment for Microsoft Windows, PlayStation 4, Xbox One, Nintendo Switch.