Ultimate Tic Tac Toe Game http://mathwithbaddrawings.com/2013/06/16/ultimate-tic-tac-toe/
Rules: 1. Select one of the board and play. 2. Your opponent will have to play in the board previous to the board you've played. 3. If that board is already won/drawn, then your opponent can choose any board to play. 4. Play until you win 3 boards that are adjacent in a straight vertical/horizontal/diagonal line.