Which books can have lessons?

Sudoku •1 min read •5 views •Updated Oct 1, 2026

Books of 9 x 9 grids: classic, Sudoku X, jigsaw, killer, thermo and arrow. Samurai, 16 x 16, 6 x 6, 4 x 4 and kids books have no lessons.

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What are the solving lessons? Which techniques get a lesson? What does "first needed at Hard" on a lesson mean? I see "The pencil marks in the lessons are X pt: KDP needs 7 pt or more."

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