This free book has everything to get you started doing Calcudoku's: 100 puzzles, ranging from very easy to quite difficult.
The puzzles range in size from 3x3 to 9x9.
The first 40 puzzles are... More > relatively easy, the next 40 are of medium difficulty, and the final 20 are difficult.
If you're not familiar with the rules of Calcudoku, then go to www.calcudoku.org and try some of the puzzles there. You can even score points by submitting solutions of the puzzles in this book!< Less
The mathematical puzzle CalcuDoku is fast becoming very popular. Solving one takes a combination of Sudoku-style logic reasoning and basic math skills, making it a much more interesting and... More > satisfying puzzle. However, it is still not easy to find challenging CalcuDoku puzzles. This book has only those: 101 puzzles, each of which will keep even experienced puzzlers busy for at least half an hour. Included are, for example, puzzles using zero, the modulo operator, many 10x10 puzzles, one 12x12 puzzle, and even one 15x15 puzzle! The puzzles are printed at a large size, leaving plenty of space
for notes. The third edition has twenty of the popular new "twin" puzzles: pairs of puzzles with the same solution, but with a different layout, so you can use clues from each puzzle to solve both.< Less