Oct 23, 2015 - For people who enjoy crosswords and Sudoku, now you can test your English vocabulary and Math skills together in a creative way with the free release of AZ09 on the App store. You get 15 blocks, each has a letter and a number. There are empty blocks for the 4-letter word and 3-variable Math equation. You have to construct an existing 4-letter word in the English dictionary and solve the Math equation at the same time. Are you up for the challenge?