for the past year and a half I have been unable to stack any more than 31 cubes on top of each other despite multiple attempts. However, this time I was able to solve many of the issues and finally push beyond the 31 cube mark, eventually stacking 35 cubes on top of each other. Stacking this many cubes on top of each other requires a very steady hand and precise placement of cubes, especially when they begin leaning in one direction anyway.