Böcker av Godefridus

A book of many puzzles mostly in the Sudoku family, many of which are Killer Sudoku. There are many hints as to how these puzzles are made. Also included Kakuro, Futoshiki, Hittori, Slitherlink and others. Try your hand at the original puzzles, as invented in the eighteenth century by the great Swiss mathematician, Leonhard Euler.