300 16x16 Mega Sudoku

300 16x16 Mega Sudoku is Sudoku for when 9x9 feels too quick. Each puzzle has 256 squares to fill, divided into sixteen 4x4 boxes, and each book holds 300 of them.

There are three books, each covering its own range: Easy to Hard, Medium to Very Hard, and Hard to Extreme. That makes this series the natural way into 16x16: start with Easy to Hard to get used to the bigger grid, then move up as you get faster.

The rules don't change. Every row, column and 4x4 box holds each of its sixteen symbols once. What changes is the scale: there's much more to keep track of, and each puzzle gives you a long, absorbing solve.

The books are printed at 8.5 x 11 inches. When the Hard to Extreme book feels comfortable, Hard Core 16x16 Sudoku 200 has nothing but Hard and Very Hard puzzles. For a mix of grid sizes, try 900 Sudoku Size Variations.