It hasn't failed. Not if you do what crowdsourcing requires and suggest a better replacement. I agree that "Solving 2D geometry puzzles using 3D reasoning" doe

It hasn't failed. Not if you do what crowdsourcing requires and suggest a better replacement. I agree that "Solving 2D geometry puzzles using 3D reasoning" does not fit the actual topic of the video, so I have replaced it with "Geometry puzzles with 4D analogies" for now – which is also not quite right, since the largest part of the video doesn't refer to any 4D concepts. I think it's, more generally, about puzzles that can be more easily solved by considering any other dimension, but it's harder to make a good title out of that. Do you have another idea for an improvement?