Samurai Challenge
A samurai is a set of five sudoku. Any grid could be solved by itself but needs to take clues from neighboring grids. This book contains 80 samurai at three levels of difficulty. As a bonus you will find 10 shogun, each of which is an amalgamation of 11 sudoku. Finally, there are 10 sumo, which are an aggregation of 13 sudoku. Pleasure at its best!!!