How to play
- Light moves first. Tap a column to drop your disc; it falls to the lowest empty slot.
- The first to line up four discs — across, down or diagonally — wins. A full board 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: Left and Right move between columns, Enter or Space drops.