(I am in no way associated with any company, person, or game (including but not limited to Apple & iTunes) mentioned in this post. Just wanted to say that before someone tried to say I was attempting to sell these apps through this post.)
SpellTower is a mix of Scrabble & Tetris & a word search. As you can see in the graphic above you drag across letters to make words. Each time you make a word another layer of letters comes from the bottom. Don't let the letters hit the top or the game is over. There are different difficulties as well. This app was also $1.99. It's loads of fun though.
Lastly, Flow. I laugh every time I think of the name of this game. That's just my twisted mind though. Anyway, this game is great. The object is to fill the entire screen by connecting the colored dots together. You cannot overlap colors and if you have to correct a line your moves counter takes that into consideration making you come in that many above the flows counter. They also have a flow bridges but it's not as fun. This app was free but you have the option of purchasing add ons.