Positive brain awesome game. Suitable for adults and children. 6 puzzles per page. 500 CalcuDoku sudoku puzzles 6x6 medium levels. 502 CalcuDoku sudoku puzzles 6x6 hard levels. Thick paper. Glossy cover. Calcudoku may be called or searched with the following phrases or names: cendoku, calcudoku, kendoku, sudoku game, maths puzzles, kendoku puzzles, daily sudoku, mathdoku answers, calcudoku solver, mathdoku solver, sudoku puzzles, sudoku brainium, malacca, sudoku math puzzles, maze, mathdoku, mathdoku puzzles with answers, campo santo, jigsawdoku, futoshiki, inky puzzles, fantino, sparkchess, shabash, mandate, permainan sudoku, dkm shisen, sudoku sudoku, math sudoku, calcudoku answers, qonqr, beachball pop, mathdoku rules, sudoku puzzle game, itrash, calcudoku rules, calcudoku puzzles, iball touch, andoku, void runner, numby, mathdoku 9x9 answers, life sim, nextoy llc, sudoku normal, sumoku sudoku, puzzles similar to sudoku, punch clock, hitoshi puzzle, gem lites, ryukendo, tetcolor, gichtel, crazy turtle, ticbits sudoku, listen to masters, card wars, newspaper maths puzzles, polar bear escape, mnemosyne, patrick min, sample sudoku puzzles, gametimer, japanese math puzzles, sudoku with friends, hidden ships, letter ladder, week end, jigsaw master, game like sudoku with math, mathdoku 6x6, sudoku hd, su du ku, real sudoku, ghetto crew, math puzzle games like sudoku, cijferpuzzel, sudoku countdown, math games like sudoku, infinity maze, andoku 2, blocked guy, name that tune, olivia chomentowska, math puzzles like sudoku, hitoshii, japanese math games, mighty fin, gomrath, medieval escape, megamaze, tap dash, how to play mathdoku, drop match, how to solve mathdoku, catch and match, triva, memory drop, kendoku solver, mini rpg, trak 4, tomtom puzzles, bug droppings, hidden tales, k doku, how to play calcudoku, doodle hunt, kendu solver. I hope you enjoy these puzzles. Best regards, Basford Holmes