60 fun-filled pages of puzzles combining two previously published puzzle books into one inexpensive ebook. 7 different types of symbols including electronic, geometric, architectural, and mathematical symbols. These 174 symbol sudoku puzzles offer your brain a better workout than regular sudoku. Printout the puzzles you want to solve, check your solution in your ebook. Each book contains easy, medium, and hard levels of play. This puzzle ebook may be converted to PDF if required. See my blog for details. "Solving these puzzles was challenging and fun", "Enjoyed solving your puzzles", "I couldn't put them down".