App Name: 7 Little Words [Android, iOS App]

Cost: Free

Developer: Blue Ox Technologies

App Market: Download Page

Description:

7 Little words is an extremely popular word puzzle game that you can play on your mobile devices or online.  The rules are simple: Each bite-size puzzle consists of 7 clues, 7 mystery words, and 20 letter groups. Find the mystery words by deciphering the clues and combining the letter groups.

This is a neat little app that help exercise your brain.
Check out this site where they discuss and post possible solutions.

Download for iOS