3-D Tic-Tac-Toe is a video game released in 1978. It is a three-dimensional version of the classic Tic-Tac-Toe game, where players must place their markers in a 3x3x3 grid to achieve victory. The game features different levels of difficulty and allows players to compete against the computer or another player. With its unique twist on a familiar game, 3-D Tic-Tac-Toe provides an engaging and challenging gaming experience.