This is a 3D stackable tic tac toe game.

"How to play:
The game is basically the same as regular tic-tac-toe: you try to win by getting three X’s or O’s in a row. The trick is, instead of one grid of nine squares, you have three grids of nine squares, all stacked on top of each other. A diagonal, horizontal, or vertical set of three lets you win, but since the game is 3-D, there are many more winning possibilities, some of which are shown here:" From https://www.thegamegal.com/2010/08/18/3-d-triple-decker-tic-tac-toe/