For those of you who are Sudoku Addict, this game is a must ! Even at easy level, it can take you hours to solve the puzzle out. Sure, it takes a little to get familiar with red and green tags. But once this concept is assimiled, what a great idea ! Congratulations Houdah guys, and thank you. One more thing ! I dont like the wooden background. Not in the iPhones spirit... GHa