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2019-Aug-17: Volumes 19 and 20 of Killer Sudoku are out. Enjoy!

Tough 8x8 Ripple Effect Puzzles by KrazyDad

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 browswers. If you like these puzzles, also check out my other puzzles.