This seems easier than the 2D version. I think it's because there are more possible moves - six instead of four - so even if you play at random there's more of a chance that some move is available.
Agreed. Though I've only played the 3D version twice, my win rate is 50% and i only see it increasing. The 2D version is a little more challenging.. I think I win roughly 25% of the time as luck plays a bigger role (at least with my strategy).
Plus you don't seem to be able to lose (or at least for me). So it's really easy!