TicTacToe online against the computer. First to get 3 symbols on a row wins.
Source is PD and available off the site.
Toe - 3D tic tac toe. Get 4 in a row against the computer. Tic Tac Toe - Four dimensional version of this game. The largest java tic tac toe site on the web. Includes tic tac toe, toe tac tic, and 4x4 tic tac toe.