Tower of Hanoi
The Tower of Hanoi (also called the problem of Benares Temple, Tower of Brahma or Lucas's Tower, and sometimes pluralized as Towers, or simply the pyramid puzzle) is a mathematical game or puzzle consisting of three rods and a number of disks of various diameters, which can slide onto any rod. The puzzle begins with the disks stacked on one rod in order of decreasing size, the smallest at the top, thus approximating a conical shape.