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)