How to play
- Light moves first. Take turns placing a disc on any empty square of the 3×3 grid.
- Three of your discs in a line — across, down or diagonally — wins. A full grid with no line is a draw.
- Hard plays perfectly: the best you can do against it is a draw.
- Undo takes back your last turn. Games save automatically — leave and pick up later.
- Online: choose Online friend, create a game and share the code or link. Your friend opens it and plays from their own device.
- Keyboard: arrow keys move around the grid, Enter or Space places a disc.