Cezary Rajkowski has Dragon Hills (iTunes Link) for the iPhone, iPod Touch, iPad in the iTunes App Store for FREE (regularly $1.99) for a limited time.

Are all Princesses really waiting for Princes to come and save them? Not this time!
Take control of a very dangerous Dragon in this action-packed adventure and help the furious princess on her revenge mission. Slide down the hills jumping into and out of the ground, crashing and destroying everything on your way.