Let's face it: Tic Tac Toe is pretty lame. As definitively explained in WarGames, given a competent opponent, the game will always end in a tie. That kind of sucks, but at least if we played on this mirror board, we could make up for the lack of fun by admiring the cool design.
Designed by Shahar Peleg, Mirror Tic Tac Toe cleverly supplies only half X's and O's to play with, which become "whole" once they're placed on the board, thanks to their reflections. It's the perfect game-room companion to your chess set with the self-cloaking pieces.