KenKen: For Experts Only: 100 Challenging Logic Puzzles That Make You Smarter;

The most diabolically difficult KenKen puzzles yet! Get ready for 100 of the most brain-bending, mind-melting 9x9 KenKen puzzles ever. This collection of super hard 100 9x9 puzzles has been hand-selected by our most experienced team of “Kenerators” to intrigue you, challenge you, and keep you entertained for hours. Take it anywhere…you can never get enough of KenKen, “The Puzzle That Makes You Smarter.”