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January 16, 2022: Volumes 23 and 24 of Printable Killer Sudoku are out! Happy puzzling!

Challenging 8x8 Ripple Effect Puzzles by KrazyDad, Volume 2

Each booklet contains a collection of 12 different puzzles, with the answers in the back.

The books are ordered by difficulty. The higher the book number, the harder the puzzles. If you are new to Ripple Effect, I suggest you start with Book 1.

These booklets are in PDF format and should print from most web browsers. If you like these puzzles, also check out my other puzzles.