Word Quest is a basic word-search game for the iPhone.  At $0.99, it offers unlimited game play that incorporates not only different difficulty levels, but twenty different lists of words.  I found the variety to be very entertaining.  Game play is very simple as you can not only tap the first letter of the found word and dragging to the end of the word, but you can also just tap the first letter and then the last letter.  There are even hints available if you get stuck.  The graphics are nice, and the interface very intuitive.  Overall, it is a fun game for when you have a few minutes.  Anyone that likes word games will not be disappointed with the versatility of this one.