Save the 3D rule for the future, after the team have some experience for developing 2D... at least. I suggest finishing the three phases of the game first, before moving on to expanding and improving the rules.
PS, I had no idea that the height is going to be 30cm... well I'm not saying that I'm a paper purist, but people like me can't really get hold of a suitable stick of wood (or any specific modeling material except paper) that easily, if you don't happen to have a hobby supply shop nearby...
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