Play against the AI or another person
OPTCG AI is a free, unofficial fan-made One Piece Card Game simulator that runs in your browser, with no download required and a mobile-friendly design. Use a preconstructed deck, build your own from scratch, or import one.
![Sealed English booster box of ONE PIECE CARD GAME EXTRA BOOSTER -ONE PIECE HEROINES EDITION- [EB-03]](/static/images/prizes/eb03-box.webp?v=137f7b651c559dd8)
Season prize · Competitive
The season's #1 wins a sealed EB-03 booster box
Season prize · Competitive
The season's #1 wins a sealed EB-03 booster box
Prepare for your next game with OPTCG AI, a free One Piece Card Game simulator that runs in your browser. Choose your deck, select an opponent and adjust the difficulty to practice at your own pace, on desktop or mobile.
Get familiar with a new leader, try different opening hands and practice decisions such as when to attack, save counters or allocate your DON!!. Focus on a specific matchup by choosing the AI opponent’s deck.
Start with an available deck or build a custom list using the cards supported by the simulator. You can also import your deck and test it against AI or other players.
Adjust your list between games and see how it performs against different leaders and play styles. Practice helps you understand your options before bringing the deck to the table.
Build or import a deckCreate a private table and share the code with a friend, or choose a public queue to find another player. Play One Piece TCG online in your browser, without installing an app.
Alternate games against AI with matches against people to test your decisions against different approaches to the game.
Play against another personExplore the community’s recent games and review their replays step by step. Discover how different leaders are played, follow the attack order and study how each decision changes the game.
Replays let you pause at a move and think about what you would have done in that situation.
Watch recent gamesYes, the simulator is free.
No, you play directly in your browser, on desktop or mobile.
You can play as a guest. With an account, you can access your decks on other devices and view your match history.
Yes, you can select an opponent’s deck from those available for the AI.
Our team develops the AI opponent specifically for One Piece Card Game. It does not use a large language model (LLM), such as ChatGPT, to choose its moves.
Our AI learns through training games against other agents. During play, it evaluates the board and, on Medium and High difficulty, simulates possible continuations to compare moves and identify opportunities to win. High difficulty spends more time analyzing the position. Technically, it combines reinforcement learning (PPO) and Monte Carlo Tree Search (MCTS), adapted to handle the game's hidden information.
The AI uses visible game information: cards in play and in the trash, DON!! cards, and the number of cards in your hand, deck, and Life. It can also remember cards revealed during play.
The AI cannot see your hidden cards: the cards in your hand, your face-down Life cards, and the order of your deck remain hidden, except when an effect allows that information to be known.
No, it is a fan project with no official affiliation with Bandai.