Skill Builder Sudoku: Medium to Hard

<B>Build up your sudoku skills from easy to expert!</B><BR/><BR/> In this three-book series, each book helps solvers build their skills to get from one level to the next. <I>Medium to Hard</I> will build on the skills learned in the first book, <I>Easy to Medium</I>, gradually introducing more advanced techniques (like jellyfish and finned X-wings) alongside puzzles designed to hone those skills, giving solvers plenty of opportunity to practice, and to build the confidence to continue on to the next volume.