Wordoku by FlashGamesFan.com

ゲームの説明
Play our Wordoku, a variant of famous Japanese Sudoku game with more than 2000 levels (easy and hard)!
How to play
Fill a 9x9 grid so that each column, each row, and each of the nine boxes (also called blocks or regions) contains letters from A to I only one time each. The puzzle setter provides a partially completed grid.