Ultimate Tic-Tac-Toe

From BoardGameGeek:

Tic Tac Ku is played on a game board which is a 3 x 3 grid of Tic-Tac-Toe boards. In the simple game, the object is to get a Tic-Tac-Toe on any of the 9 boards. In the advanced game, the object is to get 5 Tic-Tac-Toes.