Looks great! Best 3D LED implementation I've seen (because of the frosted LEDs).
Just FYI: the game of 3x3x3 3D tic-tac-toe with two players is flawed. You need to have 4x4x4 to be playable.
In 2 person 3x3x3, the person that goes first will always win (unless that person has had half of their head removed by a rogue snowshovel).
From Wikipedia Tic-tac-toe:
... 3-dimensional tic-tac-toe on a 3×3×3 board, though the first player has an easy win by playing in the centre if 2 people are playing. Another variant is played on a 4×4×4 board, though it was solved by Oren Patashnik in 1980 (the first player can force a win)[5]. A more complex variant can be played on boards utilising higher dimensional space, most commonly 4 dimensions in a 3×3×3×3 board. In such games the aim is to fill up the board and get more rows of three in total than the other player or to play with 4 people and get 1 row of 3.
Maybe you can add the extra levels for your next prototype.
b