Level 5 - Basic
two keys appear to be permanently linked. No matter how you look at it, there seems to be no way to unlock them. However, as a highly popular puzzle since its creation during the 19th century puzzle craze, the keys are in fact separable.
Metal, 4 1/2 x 1 1/8 x 1 in.(11.5 x 2.9 x 2.7cm).