I find this booklet very well done! :-) The difficulty comes from medium to fiendishly difficult. Since not only the classic 9x9 Sudkoku is represented but also other variants (12x12, 16x16, freeform, sums ...) is it so fast also not boring. The puzzles are solved by reasoning and not by guess and try. :-) Featuring I find appealing. The only downer, it seems new every 2 months. :-( Too rare in my opinion !!!
