Fresh formats for seasoned Sudoku fans looking for a challenge. 210 Sudoku sized at 10 x 10, giving solvers 100 squares to fill instead of the traditional 81. Half the puzzles feature rectangular 5 x 2 boxes inside each grid, and the rest come in various random shapes.
Frank Longo has had more than 3,000 crossword puzzles published since 1993, and in the past few years has turned his attention to the Sudoku craze. He has published over 100 Sudoku books, including Oy Vey! Sudoku; Absolutely Nasty Sudoku Levels 1, 2, 3, and 4 (9781402743962, 9781402743979, 9781402743986, 9781402743993); The Sudoku Code (co-authored with Francis Heaney); and Puzzlewright Guide to Solving Sudoku (9781402799457, co-authored with Peter Gordon).