Copyright (c) 1998 Sean Bridges
This game is played on an empty 3x3x3x3 cell board (or one 9x9 square board):
|N rows 4
The green dots show all the 3 in-a-rows that include the black stone.
This game was a victory for White, which won 73-42.
There is a Java program to play 4D Tic-Tac-Toe.