Publisher's Synopsis
Are you ready for the next generation of CalcuDoku that is certain to blow your mind?
Taking CalcuDoku puzzles to a whole new level, CalcuDoku Hard is a book that is designed for professional puzzlers who are looking for a real challenge. But, if you think you've got what it takes to take them on and win, get a copy now and test yourself like never before.
Don't delay. Get a copy of CalcuDoku Hard today!