Nothing is installed and nothing is registered. Open the page, and the game runs in the browser you already have.
| Against the AI | Choose a deck and start. The opponent plays with the same rules and an ordinary player's view; difficulty and thinking speed are separate settings. |
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| With a friend | One player creates a room and shares the room code, the other joins it. Both confirm they are ready, a coin toss decides who picks the starting player. |
| Ranked | The queue pairs you with a real opponent close to your rating, which starts at 1000. Leaving the queue or closing the dialog cancels the search. |
Cards & Decks holds your collection and your own decks. The workshop searches the full pool, marks forbidden cards, shows copy limits, and explains where a missing card can be obtained — from boosters, prebuilt decks or side missions. Finished decks travel as deck codes or YDK files, so a deck built elsewhere can be brought in.
Your collection and campaign belong to a private profile key in your browser, not to an account. Use “Back up & transfer profile” to reveal that key and restore the profile on another device. Clearing your browser data without that key loses the progress.
A current browser on a desktop computer, tablet or phone. The arena uses 3D graphics where the hardware allows it and falls back to a plain 2D board otherwise. Duels run over a WebSocket connection to the server, so a stable connection helps; if a tab loses its connection the duel waits and reconnects.