I've heard such amazing things about this trick but my cards wouldn't scratch off right and as a
result, one of the numbers on one of the cards could not be read. Penguin sent a replacement and the
same thing happened. The silver scratch-off materiel just wouldn't scratch off clean. Penguin sent
me another one and I had the same issue.
MY RATING IS BASED ON THE MATERIAL, NOT THE
EFFECT. I ordered the British Pound version so maybe the US version is better or maybe the material
ages poorly. In the end I've just considered it a loss.