3D Tic-Tac-Toe, released as Tele-Games for the Atari 2600, is a classic early video game that expands the traditional tic-tac-toe formula from a 2D plane to a three-dimensional 4x4x4 grid. Players challenge either the computer or a human opponent in an attempt to align four of their markers vertically, horizontally, or diagonally. Released in 1980, this game is a test of strategy and spatial awareness in the puzzle genre.