Go right to the room with talking statue. As Beak-Beak jump on the red button on the floor. As Tommy go right and push the orange creature - you can do this only when Beak-Beak is standing on the button.
Jump on the orange creature and take a lever which is lying on the right.
Go back to the first room in the tower (left). Use the tentacle to go one level down. Go right and in the place with cannon and weird birds put the lever in the wall on the left. Go to the left and then again left through the green hole.