The game lacks the online co-op from the other versions. The game supports local two-player co-op supporting two sets of Joy-Cons or Pro Controller. There are 3 levels to this mode that unlock upon completion of the level prior. There is also a Log mode where the player travels island to island unlocking new characters. The game has a story mode based on plot of the manga. Some characters have a special second state that activate with Kizuna Rush though these need to be unlocked with ingame materials. Maxed out Kizuna Gauges can be used to unleash the Hero Power with different effects such as damaging all enemies and restoring HP. The game features gameplay similar to its predecessors, though with some brand new changes introduced. It was first announced at the 2019 Anime Expo. It is the fourth installment in Pirate Warriors franchise, following One Piece: Pirate Warriors 3 in 2015.
There are NPC support characters (called the Crew) that can fill the Kizuna Gauge. One Piece: Pirate Warriors 4 is a One Piece video game released for the Sony PlayStation 4, Xbox One, Nintendo Switch and PC.
The main new mechanic is the Kizuna Rush where one character is joined by up to four characters to perform a combination attack.
The game has the player play as one of the One Piece characters.
