
Not so fast.
I don't purport to have the ability to solve the elusive Rubik's Cube. Nor do I contend that the Rubik alone will give you a decent injection of anxiety.
But, and this a major but, if you can get your hands on the all-grey-toned Rubik's Cube, this puzzle will drive you over the brink of anxiety into nearby phobiaville because it is exceedingly difficult to see the different toned squares.
Good day.