Welcome to the Angry Birds world! Where tiny little birds are having a big fight with the nasty pigs. I bet that that you have played this game before so lets skip the introduction.
You will have to defeat the pigs in each level by capturing them beneath the ruins. To do that, load the birds in a big sling and launch them towards the pigs buildings. Be careful, because the number of birds are limited and if you won't succeed, then those bad animals will laugh at you.
To launch a bird, press and hold left click mouse button, aim and then release to shoot. Some of them are having a special ability once launched. To use their ability simply press left click on your mouse. No go and destroy all those pigs.