Help the blue alien to escape from the tunnels he fell into. Dr. Boom can break the yellow bricks, Mrs. Gravity can cancel out gravity and will pull the extra-terrestrial up. Mr. Pull is kind of like a magnet, pulling his blue friend up with him. Blue stones can't break, and the gravity of the turning blocks can't be canceled out. You will need to think very carefully about which order and in which location you use your extra-terrestrial support!
Click on an alien to 'activate' it, drag him to the place you want him to fall and click. Click once more to let the alien do their job: cause an explosion, cancel gravity or pulling the blue alien along.