Excite tic tac toe

This game is tic-tac-toe. But it's not nomal tic-tac-toe.When you place the 4th top, the top placed on the 1st disappears.When you place the 5th top, the top placed on the 2st disappears.Let's try!Thank you.※I'm Japanese Developer. Please teach me English.( iamemustan@gmail.com )