3D Tic-Tac-Toe

3-D Tic-Tac-Toe is, as the game title implies, a version of the game Tic-Tac-Toe played on a 3-D board. The game board consists of four planes each with a 4x4 grid. The object of the game is to be the first player to place either four X's or four O's in a row on the board. The line of four X's/O's can be placed either on a single plane horizontally, vertically, or diagonally, or across all four planes in vertical or diagonal lines.

This game is for one player against the computer (the player is X, and the computer is O). Two different skill levels are available.