So you like a challenge, but a run-of-the-mill 9 x 9 x 9 Rubik's Cube just doesn't melt your brain anymore... How about tackling a colossal 33 x 33 x 33 twisty cube, like this 3D-printed creation from ...

True devotees of The Cube have long abandoned the classic Rubik's brand puzzle for faster, sleeker (and more expensive) 'speed cubes' that can twist at the high rates that racers demand. Alternatively ...