Recursive SAS Macro: A Fun Application
Source: SAS Institute
The Eternity II puzzle is an edge-matching puzzle, which involves placing 256 square puzzle pieces into a 16×16 grid so that adjacent edges match in both color and shapes (collectively called "Colors" here). The full 256-piece Eternity II puzzle has been designed to be difficult to solve by brute-force computer search. Simpler versions with fewer pieces are also provided.