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A unique kind of puzzles, previously unpublished! CalcuDoku puzzles in Samurai (Gattai-5) layout, meaning that in each puzzle there are actually 5 of them. Therefore, each of the 75 puzzles takes much longer to solve and is five times more exciting! In this book, puzzles range from 5x5 to 8x8 (of course, both times 5!) in size. CalcuDoku puzzles are also known under many different names. These Sudoku-like puzzles require you to use all four basic arithmetic operations: +, -, * and /. One must develop new skills and find new techniques in order to solve them. All in all, lots of fun is absolutely guaranteed!