From FamilyFun >>> "Take the game of Xs and Os outside -- and into the air -- with this supersize version. On a flat surface, adhere strips of duct tape to a shower curtain liner, as shown. Use more tape to make Xs on four flying disks or heavyweight plastic plates. You'll need four more disks or plates for Os. To play, set up a throw line, then follow the rules of tic-tac-toe. If your disk lands off the board, in an already-claimed square, or centered on a line, throw it again. For a more challenging game (or for a parent who's playing with a kid), nix the second chance for errant tosses. Use rocks to hold down the board on a windy day."