ABSTRACT
With three matchsticks, divide the factory block into two parts of the same area.
Th e 16-digit number of a Puzzle Card credit card is ciphered in 16 vertical stripes as shown. Can you decipher it?
Six identical coins are arranged into a triangle as on the left. Making only “horizontal-pair” moves, and observing the “double-touch” rule, turn the triangle upside down as on the right. Achieve the goal in the least number of the moves. A “horizontal-pair” move is an orthogonal slide of any two horizontally adjacent coins as shown in the small diagram beneath the goal position.
