I just finished my first iOS app, FoundIt and FoundIt Lite. It is a hidden objects game where the objects are jumbled together. One of the goals was to make players able to play for a much longer time than existing hidden objects games. Each puzzle has between 50 and 200 objects to find (20 at a time). The Lite version is the exact same as the full version with only one puzzle and the obligatory button pointing you to the full version.
Here are some screenshots:
Here is a video of gameplay on youtube:
More screenshots and the video can be seen on the swenGames.com website.