Trimula is Skansen Designs implementation of 3D Noughts and Crosses. It looks from the box that it was released sometime in the 70s. The contents consists of a clear plastic 3D game board which can be assembled and disassembled at will, and a more than adequate number of large glass marbles in two colours. It is essentially a Tic Tac Toe game in 3 x 3 x 3There are a number of other such games where the players use 3 boards arranged to yield 27 playing positions.A different game has also been been marketed as '3D Tic-Tac-Toe' which is played with X and O beads on pegs. See pictures in the image collection. There are thus at most 9 possible moves at any given time. The game is a bit more subtle than the 27 position game. It's not nearly so easy to set traps. - BoardGameGeek