Tap an intersection once
Edge intersections keep enough touch space, so you can place accurately without zooming.
PLAY
Learn by playing the AI
Choose a level and ruleset, then start a new match. All calculations run on your device, and the cached game can continue without a network connection.
Use arrow keys to move and Enter or Space to place a stone.
MOBILE UX
Comfortable play on a phone
Track the last move and hint
A dot marks the last move, a pulse marks a hint, and the winning five are highlighted.
Undo a mistake
In AI mode, undo returns both your move and the AI reply so you can reconsider the position.
AI LEVELS
How the levels differ
1Best for learning
Beginner
Checks immediate wins and blocks, then introduces variation among several reasonable candidates.
2Practical play
Intermediate
Balances attack and counterplay and uses open threes, open fours and crossing threats more consistently.
3Calculation training
Advanced
Uses time-limited alpha-beta search and assumes stronger defensive replies before choosing a move.
FAQ
Game questions
Is Renju practice identical to official tournament adjudication?+
It teaches the core restrictions—double-three, double-four and overline. It does not replace a full referee engine for every false-three and opening-rule edge case.
Do hints affect match records?+
No special penalty is applied. A hint highlights a candidate but does not place the stone for you; the final result is recorded normally.
Does the AI work offline?+
After the site has loaded once and its files are cached, the core game and course functions can run offline.