About this sudoku book
Twenty hard sudoku puzzles with roughly 27 given numbers, two per page. Each one has been checked to have a single solution, and none can be finished with singles alone: at some point you will need pairs, pointing candidates or a careful bit of what-if. Twenty to thirty minutes a grid for an experienced solver.
What’s in the PDF
- Pages 1–10: 20 9 × 9 puzzles, 2 per page (27 clues each), every one with a unique solution.
- Pages 11–14: all the solutions, with the given numbers in bold.
- Black and white, US Letter with 18 mm margins, so it also prints on A4 at 100 % scale.
Tip: When you stall, look for two cells in the same row, column or box that share the same two candidates: that naked pair clears those numbers from everything around it.
NumbersLogic
