《航海王：喬巴大冒險》（One Piece: Chopper's Big Adventure）是專為WonderSwan掌機開發的角色扮演遊戲，由萬代推出，於2003年10月16日發售。採用完全原創劇情，故事設定在一個神秘小島上，並以《航海王》人氣角色為主角。遊戲開頭，草帽海賊團抵達島上探險，卻發現村莊中空無一人。當他們在島上過夜後醒來時，所有船員都被神秘力量變成動物：路飛變成猴子、索隆變成老虎、娜美變成貓、香吉士變成狐狸、羅賓變成鸚鵡，而騙人布/烏索普則變成河童。唯一保持原樣的是托尼托尼·喬巴，玩家將以他為主角，踏上拯救同伴的冒險旅程。

核心目標是幫助喬巴收集各種草藥與材料，調製出能將船員恢復成人形的治療藥。需探索不同地圖、收集道具、擊敗敵人，以獲得所需材料。每個關卡都會自動生成地圖，使探索過程充滿新鮮感和隨機性。此外，還加入多種小遊戲，考驗玩家對喬巴七段變化能力的靈活運用，例如利用變形技能突破障礙、應對敵人攻擊，甚至在地城中召喚已變成動物的船員作為支援戰鬥，增加策略性和趣味性。

在操作上，進行探索與戰鬥，通過擊倒敵人來獲取材料，並在安全的區域調配治療藥。隨著遊戲進程，可依據情境切換喬巴的各種變化型態，靈活應對不同挑戰。其他船員在戰鬥中作為支援角色，也會根據自身能力提供助攻，讓遊戲過程更貼近原作團隊合作的精神。

遊戲角色方面，主要操作托尼托尼·喬巴，而魯夫、索隆、娜美、香吉士、羅賓和騙人布等船員則以支援角色登場，並各自擁有獨特的攻擊方式。敵人則包含島上各種怪物及Boss戰，玩家需善用道具與角色技能克服挑戰。

在市場評價上，因為完整保留《航海王》的角色魅力、幽默感與冒險精神，受到WonderSwan玩家的肯定。遊戲雖然受限於掌機硬體，畫面為2D風格，但角色表現生動、技能變化多樣，探索與收集要素豐富，對喜愛角色扮演與《航海王》的粉絲而言是一款值得體驗的佳作。其隨機生成地城、小遊戲、支援角色系統及變身機制，使即使重玩也能保持新鮮感，被認為是掌機平台上《航海王》遊戲中最具創意和趣味性的一款作品。

One Piece: Chopper's Big Adventure is a role-playing game developed specifically for the WonderSwan handheld by Bandai and released on October 16, 2003. The game features a completely original story set on a mysterious island, starring the beloved characters from the One Piece series. At the beginning of the game, the Straw Hat Pirates arrive on the island to explore, only to find the village completely deserted. After spending the night, they wake up to discover that all the crew members have been mysteriously transformed into animals: Luffy becomes a monkey, Zoro a tiger, Nami a cat, Sanji a fox, Robin a parrot, and Usopp a kappa. The only one remaining unchanged is Tony Tony Chopper, whom the player controls on a quest to save his transformed friends.

The core objective of the game is to help Chopper collect various herbs and materials to concoct potions that restore the crew to their human forms. Players must explore different maps, gather items, and defeat enemies to obtain the necessary ingredients. Each stage features procedurally generated maps, adding freshness and unpredictability to exploration. In addition, the game includes a variety of mini-games that test the player’s ability to utilize Chopper’s seven transformations creatively, such as using shape-shifting skills to overcome obstacles, respond to enemy attacks, or even summon animal-transformed crew members as support in dungeons, adding layers of strategy and fun.

Gameplay involves controlling Chopper to explore environments and engage in battles, defeating enemies to gather materials, and preparing restorative potions in safe zones. As the game progresses, players can switch between Chopper’s various transformation forms to adapt to different challenges. Other crew members appear as support characters in combat, assisting based on their unique abilities, which reinforces the team-oriented spirit of the original series.

Regarding characters, the player primarily controls Tony Tony Chopper, while Luffy, Zoro, Nami, Sanji, Robin, and Usopp serve as support characters, each with their own unique attacks. The enemies include various monsters and boss fights native to the island, requiring players to strategically use items and character skills to overcome obstacles.

In terms of reception, the game was well-received by the WonderSwan community for preserving the charm, humor, and adventurous spirit of One Piece. Despite hardware limitations and a 2D visual style, the characters are lively, attacks are varied, and exploration and collection elements are rich, making it a rewarding experience for fans of both role-playing games and the One Piece franchise. Features such as procedurally generated dungeons, mini-games, the support character system, and Chopper’s transformation mechanics help keep gameplay fresh even on repeated playthroughs. It is regarded as one of the most creative and engaging One Piece titles on the handheld platform.