A focused lethal puzzle trainer for One Piece Card Game.

A lethal puzzle starts from a fixed board state and asks whether the active player can win this turn. You read life totals, DON!!, hand, board, blockers, known hidden information, and available effects, then choose a precise action sequence.

The goal is not just to attack more. The goal is to prove a line: which card to play first, where DON!! goes, what attacks happen, and how the opponent can respond.

Daily puzzles are playable in the browser with fast resets, visible move logs, and local progress tracking. Each move is checked against the supported game rules so puzzle results are easier to verify.

The site is intentionally narrow: it is a training tool for tactical endgames, not a deck builder, collection tracker, marketplace, or official game client.

After each attack, the defensive AI considers the legal responses available to the opponent. Depending on the board state, it can take the hit, use a blocker, play counter cards or effects, and resolve Life triggers.

The AI chooses the response that best resists your remaining moves. It prioritizes stopping a forced win or making lethal take longer; when several defenses are similarly strong, it tries to preserve Life, blockers, counter power, cards, and DON!!.

The AI only uses the puzzle state and supported card effects. It does not invent hidden cards or make decisions outside the information provided by the puzzle.

Daily puzzles are free. Supporter codes unlock eligible supporter areas such as the archive when those features are enabled.

Codes are used only to check whether a visitor should see supporter-only content. They are not payment credentials, and they should not be reused as passwords anywhere else.