The book is a mix between less common puzzle types such as Alien Mutation (logic), Pic-a-Pix (visual logic), and Split Decisions (word puzzle), and difficult variations of common puzzles. For instance, Sudoku variants such as Cryptoku and Calcu-doku add a math or verbal twist to the familiar puzzle, and you'll find number searches, number crosswords, and Tangled Words ("reverse" word searches).
You'll have to think off the beaten track to solve these puzzles
Answer key included in the back of the book.