Players remove the brass-colored ring from this metal “E” to achieve a sense of satisfaction and superiority … or else they don’t, and hope to try again. This metal puzzle is rated “8” on a scale of 1 to 10 for difficulty. Small and compact, it can easily be stowed in a pocket, and then whipped out to test the mental and spatial acuity of random passersby. This toy was launched in March 2006.