The evil pigs have retreated into space and these angry birds are determined to destroy every single one of them. They have caught up to them and they will do just about anything to destroy them, even using their lives as a bargaining chip. You will have to fire these birds into space but be warned, there is no gravity in space so you have to be extremely careful with how you aim. The technique here is knowing how each bird will react so keep your eyes out for inconsistencies in the map. Should you fail to kill all the pigs, you will have to start over again. Never give up, everything has a weakness and you are bound to find it in due time.