Second-Degree Black Belt Sudoku

Everyone loves sudoku puzzles, finding them impossible to put down. The only problem: having enough sudokus to solve!

Created in the United States, these addictive conundrums were originally called “Number Place” puzzles until their recent rise in popularity in Japan, where the name translated as sudoku. However, in a true sudoku, unlike a “Number Place” puzzle, the grids are symmetrical. This trait makes for a more elegant solve. Every puzzle included inside is symmetrical, which is not a...