This is 3d-Tic-Tac-Toe! Win by placing four spheres in a row in any direction in this 4x4x4 board! However, if four in a row is too much, try three in a row; it is up to you. This model has a base to connect the poles that hold the balls. As a result, if you do not want a 4x4x4 board, simply remove poles until you get your desired setup. I printed mine at 75 percent scale with 10-15 percent infill. Enjoy!