Inside the books
Practice with a clear way forward
Each of our Sudoku books says what is inside it and keeps to it: the levels it names, the techniques it explains, and the answers it includes. Every book teaches the techniques its own puzzles need, with worked examples and guidance to help when a grid stalls.
Three things are true of every puzzle we print. It has exactly one solution. It can be solved using only the techniques explained inside that book, so no guessing is ever required. And its full numbered answer is included in the same paperback.
The paperbacks are made to be worked on paper, with room for pencil notes in the practice grids.