Letter Sudoku (" Wordoku " or " Word Sudoku ") puzzle is a logic puzzle similar to Sudoku, but instead of numbers letters are used (A, B, C, D, E, F, G, H, I).These are played in the same way as ordinary sudoku 9x9, with the exception that each digit is substituted with a different letter. Each of the nine letters must appear just once in each of the nine rows and columns, as well as in each of the nine subregions.The offering consists of 4 printable PDF files:file (1) Easy Wordoku with 100 puz