I mentioned Tic Tac Twice last week.  In the normal version of this game, you claim the same letter on both boards, and your goal is to make four in a row on either board.  Below is a win for the second player, blue.  Variation -- Play your piece on either board.  Your opponent automatically gets the corresponding letter on the other board.  First to get four in a row without the opponent getting four in a row at the same time, wins.
Tic Tac Twice board (remove colors to play)