The Official Book of Wordoku: Sudoku Puzzles for Word Lovers: No. 3 by Frank Longo
Here's more fun for wordoku lovers: a third for the Official puzzle collection! And this time, there's something new...several 10X10 puzzles to go along with the 9X9's and 12X12's. Wordoku follows the same basic principles as sudoku, except that solvers fill the grid with letters. Under each grid, the letters for that puzzle appear, in a pronounceable anagram, but the fun doesn't end there, because the answer to the anagram lies buried inside the grid. But beware: in some cases the anagram actually has more than one possible solution!