Tic-Tac-Toe with a Twist (aka Diffy)

This is a two-player game. Each player will need three counters that are the same (i.e. 3 nickels, 3 goldfish crackers, 3 stones, etc.). Start with a tic-tac-toe board. Players take turns placing one of their markers on the board in one of the 9 available spaces on the board. Ultimately, the goal is to form a tic-tac-toe (3 in a row across, up/down, or diagonal) with their counters, but they may not place them on the board to start the game in a tic-tac-toe formation. Players alternate turns. When it is your turn, you may use one of your counters one space vertically, horizontally, or diagonally if there is not another counter in that space. Goal is to be the first have your three counters in a row, across, up/down, or diagonal.