Your mission in this fun defense game is to protect your sheep and destroy all UFOs that are trying to steal your sheep. Build towers to protect our wholly friends from evil sheep-eating aliens. Choose a strategy to defeat all incoming UFOs and stop them from taking sheep to their mothership. Use YOUR MOUSE to place defensive towers. Click on existing towers, then on the smaller buttons located right, to apply upgrades to it. Click the tabs on the left side to active different defenses. Have fun!