Angry Birds

Angry Birds is a classic game that allows users to fling their birds at greedy pigs. The pigs have stolen all the bird's eggs, which makes the birds angry. Android users can make in-app purchases to enhance their game-play. These in-app purchases include a mighty eagle and power-ups.

There is a one time purchase of the mighty eagle. When users get stuck on a board, they bring out the eagle. Then, the eagle flies around destroying all the pigs for the user. The catch is that users can only use the mighty eagle to help them clear a board once per hour.

The in-app purchases for power-ups include Super Seeds, King Slope, Sling Slope, and Birdquake. These are also one-time purchases for users to make.