This book contains MathDoku, Algebraica, and Hybrid puzzle sets of various difficulty levels. MathDoku has become very popular in recent years and is now found in many newspapers around the world. Algebraica is a new puzzle type, that is being introduced with the release of this book. It takes the use of the grid, and of your brain, to a new level. Hybrids are a combination of both puzzles. All the puzzles are well crafted, extremely fun, and addictive.