One Piece Odyssey and World Seeker explained

World Seeker came first and aimed highest visually: a single island, Prison Island, explored entirely as Luffy with Gum-Gum traversal, stealth, and combat, in the franchise's first open world. Its reception fixed on the gap between its looks and its systems, gorgeous and thin, but its original characters, Jeanne and Isaac, were Oda designs, and its Karma system of island relationships anticipated what later games would need. It survives as a curiosity with genuine sightseeing value for fans.

Odyssey learned the right lesson and changed genre. Built by ILCA as a classic turn-based JRPG for the manga's 25th anniversary, it strands the crew on Waford island and sends them into Memoria, worlds rebuilt from their own memories of Alabasta, Water 7, Marineford, and Dressrosa, with the arcs' stories deliberately altered by the memory framing so veterans cannot autopilot them. Oda designed the new characters Lim and Adio and the game's creatures, and Motoi Sakuraba's score gives it the genre's full traditional apparatus.

Critically Odyssey is the better-regarded of the two and the one the Library recommends as the franchise's single-player entry point alongside the Pirate Warriors series: a forty-hour RPG whose turn-based systems, type charts by crew role, and bond skills model the crew's teamwork better than any action game has. Its Wano-era DLC scenario extended it toward the modern manga.

Both games are inexpensive in standard editions on all platforms, Odyssey receiving current-generation native versions, and both exist in Japanese deluxe editions with figures and art extras for the shelf. Neither replaces Pirate Warriors 4; together the three define the modern One Piece game shelf.