3D Tic Tac Toe: Get four in a row horizontally, vertically or diagonally on one plain or across all four plains. Played against the computer. (Java)
4D Tic Tac Toe: Four dimensional version of the game offering five difficulty levels. Played against the computer. (Java)
Pig-Tac-Toe: Two player version of Tic Tac Toe game played with pigs. Game requires Internet Explorer 4.0 or higher. (JavaScript)
Senor Pobre's Tic-Tac-Toe: Game played against a smart-mouthed virtual chihuahua. (Flash)
Tic Tac Toe: Game allows user to specify the height and width of the board, and the number of marks in a row needed to win. Played against the computer. (CGI)
Tic-Tac-Toe: Game offers two-player, play against computer, or computer vs computer option. Features three levels of difficulty and saved wins. (JavaScript)