Birds are angry and you can help them seek revenge on the villainous green pigs who stole their eggs. In Angry Birds you can solve physics-based puzzles by launching birds from a large slingshot into castles, buildings and other structures. The goal is to kill the green pigs and destroy their compounds. You must kill all green pigs in each level before advancing to the next challenge.

While you can choose to learn the methods of gaining 3 stars in each level on your own, it is easier to see and read advice from other players who have already mastered each round. This video game guide will help you quickly learn how to get 3 stars on Angry Birds Level 2-21.

Survey the landscape and building in level 2-21. A large fortified castle is located on the right-hand side of the screen and contains five green pigs on two levels. The top level contains two interior rooms with a pig in each. Outside the rooms, two green pigs guard the castle on a walkway. Under the top floor of the building, a large green pig resides.

Launch the first angry bird into the left, outside section of the castle, aiming for the pillar against the wall. This should kill the first green pig and starts to weaken the structure. Aim your second angry bird directly at the left wall on the covered part of the castle and try to hit the green pig inside. Throw another bird at the same area. Launch the yellow angry bird high in to the sky, with a really high arc. The yellow bird will come down hard and smash through the top floor of the building into the bottom floor, killing two green pigs in the process.

Launch the black bird into the pillar on the right side of the castle to knock it onto the remaining green pig. This will destroy the castle. You should receive a pop-up box notifying you that you have completed the level and the number of stars you received. If you did not receive 3 stars, replay the level and try to destroy the castle with as few birds as possible.

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