3-D Tic-Tac-Toe

Strategy game built on four stacked 4×4 grids instead of the flat 3×3 board. You're trying to line up four marks in a row—horizontally, vertically, diagonally, or across grid layers. That setup creates 76 possible winning lines instead of the usual eight. Play against another person or an AI opponent with adjustable difficulty. Controls use a joystick to navigate the grids and place your marks. The added dimension changes how you think about blocking and setting up wins, since threats can develop on multiple planes at once. If standard tic-tac-toe feels solved, the spatial element here adds enough complexity to make matches less predictable.