Which two-player game?
- Quick drops: four in a row — gravity, four wins.
- Flip fights: reversi — corners and mobility.
- Classic lines: gomoku five in a row, or dots and boxes.
- Remote friend: Block Battle invite link.
Playing on one phone
Hold the phone between you and take turns. Four in a row and reversi highlight legal columns or squares; gomoku uses tap-to-preview so handing the phone over won’t misplace a stone. Every game has Undo.