The classic game of Tic Tac Toe with 8 themes to choose from. Single player AI has 4 difficulty levels ranging from totally random plays to an AI that can not be beaten. The game is multi-player on the same device, or multi-platform, multi-player over the network. The game also support switching between landscape and portrait modes.
WebGL version: http://www.rifflegames.com/games/RGTicTacToe/Web/