Terms of use
Offline and online modes, time and connection rules, and saved information.
Available games and modes
Gomoku and Reversi run in a JavaScript-enabled browser without an account or separate game installation. Computer and same-device modes are available. When the online service is configured, guests can find random opponents or use friend invite codes. If no opponent is present, matching waits until another player joins or the queue expires.
The computer is a practice opponent, not a guaranteed perfect player. Online games use guest sessions and server-assigned colors, without accounts, nicknames, free chat or shared rankings.
The displayed game rules apply
Gomoku uses 15×15 Renju restrictions: Black cannot play double-threes, double-fours or overlines, needs exactly five to win, and forbidden clicks are rejected. White needs five or more. There is no tournament opening procedure. Reversi captures in eight directions on an 8×8 board, passes automatically when needed and ends when neither player can move. Read the guides for examples and exceptions.
Results are for playing under these rules. They are not official tournament records or certification of ability or qualifications.
Online waiting, cancellation and invite links
When the service is configured, find a random player in the same game or create/join a friend room. Matching may fail if no opponent is present. Queue waiting ends after two minutes; invite waiting after ten. You can cancel while waiting. Anyone with an invite can attempt to join, so share it with your intended opponent.
There is no online undo. Leaving an active game, switching modes or finding another opponent requires resignation confirmation. Read the server result, which can reflect board rules, time expiry, resignation or disconnection.
Online clocks and reconnection
Random and friend games use 30 seconds per move and last at most two hours, separately from offline time settings. A move is accepted when the server receives and validates it; a local click or device clock is not authoritative.
Disconnection allows a 60-second return grace, but the move clock continues and can expire earlier. The first applicable ending is used. Return uses the same tab’s stored secret; blocked or deleted storage may prevent recovery after a reload.
Saved information and shared devices
Offline progress, favorites and settings remain in the browser without server backup or automatic device synchronization. Online moves and state go to the server, and the per-game secret is stored in sessionStorage. Online state uses the cleanup limits in the privacy notice.
On shared devices, clear site data when appropriate. This can erase settings and progress stored in that browser.
Reporting issues and respecting content
Report incorrect rulings or controls using the email on the contact page. Include the game, mode, device, browser, turn and steps to reproduce the issue. Hide personal information in screenshots.
A game or image freely viewable elsewhere is not automatically free to copy or redistribute here. Check relevant rights and terms before using other material.