BlanksAndMore

Started brainstorming for a premium app with the following features:

• 3 different difficult levels
• displays the correct word (or gives you several tries to get the correct word)
• add some other word games.

Anybody has some ideas for other word games you like to play? Hangman seems to be popular on the Appstore. However, I personally feel it is too simple (and no challange to code). I was thinking about something like a letter soup or similar.
Any ideas are welcome.