Easy-to-Hard Mensa (R) Sudoku

A super-sequel to "Mensa[registered] Sudoku". Written by Frank Longo, one of the best sudoku creators around, it offers 534 fantastic puzzles (all in the standard 9 X 9 format) that go from very simple to extremely hard. That means smart newcomers can get started solving immediately and hone their skills as they proceed logically through the book. By the end, they'll have become experts, ready for any sudoku that comes their way!