4D Tic-Tac-Toe is played upon a 3x3 field of 3x3 grids.
 
Beginning with Black, Stones are dropped in turn upon vacant points.
 
The object is to create 3-in-a-rows. These can be either upon each individual 3x3 grid, or through points located on directly adjacent grids.
 
This can best be visualize by considering the grids in any one particular rank, file or diagonal of the field to be located one above the other in order.
 
When the last Stone is played, the player with the most 3-in-a-rows wins. Score will be kept during the game by the graph located on the right side of the field.