The iPhone App Store is crowded with many word games, but none are quite like TextTumble. A combination of Tetris and Scrabble, TextTumble adds its own style to the word game genre by challenging your ability to chain words together using shared letters. Letters aren't the only part of a word game, however; TextTumble uses pictures to spell words as well, letting you use the synonyms of a picture to form the root of a word.