with one square left empty; you solve the puzzle by sliding tiles around into numerical order. In Continental Drift, a spherical version of the 15 Puzzle, it’s the hexagonal tiles that are ...

The analogy for Nagaoka ferromagnetism has been the “15 puzzle,” the sliding-squares puzzle where you must make a picture or put the numbers in order by sliding one tile at a time. Nagaoka theorized ...

While solving the puzzle, the experts found out that a two-piece solution was not possible due to the problem’s constraints. To begin with, the triangle and square must have the same area since ...