Tiny Wings

Tiny Wings is an extremely popular game by Andreas Illiger involving a bird who tries to fly by catching a ride on hills.
At first glance, the gameplay of Tiny Wings looks very simple, but there are a lot of tricks going on under the hood. The hills and their textures are dynamically generated ( generating rolling hills of different height ), and the game uses physics to simulate the movement of the bird.
Here's a Tiny Wings gameplay:
https://www.youtube.com/watch?v=yvAoOeBGZIY