''One Piece: Unlimited Cruise'' is a video game based on the popular manga/anime series ''Manga/OnePiece''. It is the sequel/successor to ''One Piece: Unlimited Adventure'', and the second entry in the ''Unlimited'' series of sorts. Like all games in the series, it follows its own storyline. The Straw Hats participate in a strange "game" of sorts, and have to explore several islands, overcoming obstacles and challenges to obtain treasures, aided in this regard by a small, cute creature named Gabri, who opens new pathways for the crew.

Like its predecessor, the game is a fairly standard action-adventure game. You must take the Straw Hats through several islands filled with enemies to defeat, items to collect, and bosses to defeat. Said bosses and enemies are clones of the crew's old friends and foes, created from the Straw Hats' memories. You can level up the crew's moves and make them learn more by repeatedly using them in battle, and you can use the stuff you collect to have Usopp craft all kinds of bells and whistles, Chopper create healing and damaging items, and Sanji cook up various meals that enhance the crew's life and SP bars. There's also a Versus mode, where you can fight team battles against another player or the CPU; you can even play as the other characters and standard enemies in that mode.

Unlike its predecessor and successor, this entry is divided into two games: ''One Piece: Unlimited Cruise 1: The Treasure Beneath the Waves'', and ''One Piece: Unlimited Cruise 2: The Awakening of a Hero''. Both of them are rich enough to work as stand-alone games, but they work best as a pair, as not only do you then get the whole story, but you can also bring over your characters from Episode 1 to use them in Episode 2. The game was released in North America and Europe, but Japan also got a compilation of both episodes for the 3DS, called ''One Piece: Unlimited Cruise SP'', which also includes Marineford Mode, which is a recreation of the manga's Marineford Arc, adds most of the important characters from that arc as playable characters, and retweaks Whitebeard's moveset to match the manga. In Europe, the games were separated again, with ''SP'' only including Episode 1 and Marineford mode, leading to Episode 2 getting released seperately as ''One Piece: Unlimited Cruise [=SP2=]''.


* BaitAndSwitchBoss: In Episode 2, [[spoiler:Bellamy initially pops out of the first seed on the fourth island. But just as you expect a fight against him, Doflamingo comes out and chucks him away.]]
* ButtMonkey: Usopp, as usual, gets the short end of the stick in several cutscenes.
* ContinuityCavalcade: There's a whole lot of miscellaneous references to the manga, ranging from attacks to quotes, pieces of dialogue, the bosses' introductions, etc.
* DefeatMeansPlayable: You can play as the bosses and {{Mooks}} you've defeated in Versus mode.
* DualBoss: Doflamingo isn't fought alone, but with one of the other Straw Hats, who he controls with his powers. Not only does that make him more difficult, but it also means that unless you have items to revive them, they're pretty much doomed; you obviously can't select them when Doflamingo controls them, and he KOs them instantly when he releases them.
* FightingYourFriend: A few examples.
** Some of the clones the Straw Hats have to fight are of their friends, like Monster Chopper, Nightmare Luffy and Ace in Episode 1, and Vivi, Paulie and Mr. 2 in Episode 2.
** Doflamingo can force the Straw Hats to fight at his side with his powers.
** [[spoiler:The FinalBoss is a transformed Gabri.]]
* HubLevel: The Thousand Sunny, which is extremely faithfully recreated.
* NewGamePlus: After you beat an episode, you can replay it on a higher difficulty while keeping most of the stuff you unlocked and obtained in the first playthrough. It's in fact the only way to fully level up the Straw Hats' techniques.
* OldSaveBonus: You can bring over your characters and progress from Episode 1 to Episode 2.
* OneGameForThePriceOfTwo: Double subverted. Both episodes have enough content to last you quite a while gameplay-wise, but you must still get both entries if you want to know the whole story. The Japanese version of ''Unlimited Cruise SP'' doesn't have that problem, though.
* PokemonSpeak: Gabri can initially only say his name; in fact, the Straw Hats named him that precisely because he kept repeating it.
* SequentialBoss: Episode 1 has a fight against the cowardly Spandam and a bunch of Marine flunkies, followed immediately by a fight against Aokiji.
** Episode 2 has one of these for its final fight. After defeating Yami's first form (a large golemlike creature), he transforms into a much nastier creature composed of tree roots and darkness.
* ShownTheirWork: The Thousand Sunny is extremely faithful to the blueprints Oda drew for it in the manga, right down to minor details.