Positive energy for the brain. 2 puzzles per page. 30 Killer sudoku puzzles X diagonal 8x8 easy levels. 30 Killer sudoku puzzles X diagonal 9x9 medium levels. 30 Killer sudoku puzzles X diagonal 10x10 hard levels. 30 Killer sudoku puzzles X diagonal 12x12 extreme levels. 30 Numbricks puzzles 9x9 easy levels. 30 Numbricks puzzles 10x10 medium levels. 30 Numbricks puzzles 12x12 hard levels. 30 Numbricks puzzles 15x15 extreme levels. Unique puzzles. Only 1 verified solution. All answers are at the end of the book. Killer sudoku may be called or searched with the following phrases or names: sudoku, sum sudoku, killer sudoku books, times killer sudoku, sumdoku, sudoku books, easy killer sudoku, times killer sudoku books, killer sudoku puzzles, puzzle, the times killer sudoku books, times ultimate killer sudoku books, sudoku 9x9, killer sudoku puzzle books, killer puzzle, sumoku sudoku, sudoku puzzels, sudoku game, sudoku puzzle books, daily killer sudoku, daily sudoku killer, sudoku puzzles, sudoku for kids, easy sudoku puzzles, times killer sudoku solutions, super sudoku, daily sudoku, game sudoku. Numbricks puzzle may be called or searched with the following phrases or names: numbricks, numbrick, numbrick puzzle, numbrick game, numbrick logic, numbrick sudoku, numbricks puzzle, numbricks game, numbricks logic, numbricks sudoku, numrich, numrich parts, brain teasers for adult, brain games for adults, hard puzzles to solve, numrich stock, daily logic puzzle, brain puzzles, numerical, brain teaser puzzles for adults, mind puzzles for adults, brain puzzles for adults, hard to solve puzzles, numerichs, puzzles hard to solve, numerch, nucanoe, hidato puzzle, nursery, hidato solver, sudoku, nuance, hidato book, hidato, numbers, hidato puzzle books, numrich, nurture, numero, numeral, hidato puzzle solver, nutmeat, hidato answers, daily hidato, legends of yore, play hidato, hidato rules, hidato game, nubrain, hanayama, beehive hidato, hidoku puzzles, hidato challenge answers, how to play hidato, happy creatures, numbrex, hidoku solver, hidato challenge. I hope you enjoy the book. Best regards, Basford Holmes