Mark your boards to 3¾ inches with a pencil. Then use a miter saw to cut the 2x4 into 3¾ inch blocks.
Cut the 1 inch trim board to 3¾ inch sections.
Now you need to drill the holes for the marbles to fit in. Create a template so the holes are evenly spaced. Use a drill press, but don’t go too deep.
Next you need holes for marble storage. Use the spade bit and drill 2 holes in the side for the marbles.
Drill a pilot hole between the 2 storage holes. Make it 1 cm deep. Use a wood screw to hold the storage door.
The hard part is done!! Get creative and paint your tic tac toe board. Find two colors of cool marbles to use as game pieces.