iOS Pick: Red Herring
Leo Laporte's app cap on iOS Today 340 is Red Herring. This is a very simple puzzle game with multiple columns of words. Each column is a category, and you'll have to tap and drag words around until you have successfully grouped the appropriate words together. The "red herring" section has extra words, but some of them can be misleading.
Red Herring has 3 difficulty levels. Each puzzle has only one correct solution, and there's no time limit. It's free to download, and comes with 50 free puzzles. You'll also get a free daily puzzle. You can buy more puzzles and hints with in-app purchases.