I purchased Angry Birds in June 2012 for the iPod. I heard a lot of positive things about the game so I decided to play this game. The main plot of Angry Birds is that the eggs were taken by the green pigs and the birds have to get them back from them.
The levels start from an Easy difficulty, and get harder as you progress the game. Though it takes sheer luck to get past the levels, I do not mind that much considering how challenging the levels get after a certain amount of time. There are a variety of birds which have different abilities like the Blue Bird can split into three and the Yellow Bird can go flying at super speeds. There is a special bird called the Mighty Eagle which can be bought as an In-App Purchase to use whenever you want but once you use it in a level, you have to wait 1 hour for it to be usable again. The levels require some trial and error but it is nothing too bad.
This is a great game, which I recommend to kids and people who are fans of puzzle games.