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All courses and dojo problems are freely available. You can use 29 courses, 73 dojo problems, and practice games. Computer opponents unlock in sequence as you defeat the previous opponent.

Pebble purchases are available only where the payment connection is enabled. If the purchase button shows ‘Coming soon’, no payment is processed. Monthly subscriptions are not offered.

Pebbles are in-game usage credits for hints and undos. A hint costs 1 Pebble, an undo costs 2, and the standard daily grant is 3. Ordinary moves that place a Go stone on the board do not cost Pebbles.

Pebbles have no cash value and cannot be exchanged for money, withdrawn, or sent to another user. When ads are available, completing an optional rewarded ad grants 2 Pebbles, up to 5 times per day. No Pebbles are granted if an ad is unavailable or closed early.

The review for serving ads is currently in progress. If the button shows ‘Awaiting approval’ or is disabled, ads cannot be viewed. Rewards are granted only after completion of an actual ad is verified.

Even after ads become available, there may be no ads because of location, inventory, frequency, consent, or browser settings. Basic courses and games remain available without watching ads.

Learning progress, dojo records, game results, and settings are stored in the browser you used. They do not sync automatically to other devices, and clearing site data may erase them.

Where server wallets are used, Pebble balances and purchase and usage history are verified on the server. With the recovery file saved from the shop, use Restore a purchased wallet—at the same service address. The recovery file is your wallet key, so do not send it to others or publish it. It does not back up your learning progress or all game records.

Tap the screen once, then check your device volume and whether the browser tab is muted. In ‘Play’ settings, you can turn the teacher's voice, sound effects, and background music on or off. If an audio file takes time to load, try selecting the same explanation again.

Explanations are also displayed as text. You can read the rules and solve problems without sound.

The computer may be thinking, or it may be your opponent's turn. Occupied points, self-capture, and moves that repeat a board position are also disallowed. First check the message below the board.

When ‘Move confirmation’ is on, the first tap selects a point and the second plays there. This helps prevent mistakes on large boards. Selecting a 19×19 board turns move confirmation on automatically.

The computer's suggested moves and position estimates are practice aids. The life-and-death dojo explains preset problem goals and sequences. In real games, surrounding stones and ko situations can change the result.

The 30 kyu to 10 kyu labels on learning screens indicate course progress. They are separate from official ranks awarded by Daehan Baduk Hyeophoe, Hanguk Kiwon, or tournament organizers.

Check your internet connection and refresh the page. The game runs in a browser with JavaScript. If you have trouble in an in-app webview, try opening the same address in your device's regular browser.

Even where JavaScript is unavailable, you can read the Beginner's guide, this help page, and the policy pages. If the problem continues, send the affected screen, your device and browser, and the steps to reproduce it to Contact—please let us know.