The world is sinking! Save the sheep! Get them into the tower! The sheep only head towards the tower if it's high enough. A and D rotate the camera. Click the mouse buttons to manipulate the earth (Left Ctrl and Left Alt also work). Tell the sheepdog where to go with the middle mouse button or W.
Sheep run away from the sheepdog. Sheep hate water, sand, and high cliffs. The more dirt you pile up, the more ground sinks elsewhere. When it doubt, raise the tower higher!
Download and install the Unity Webplayer from here:http://unity3d.com/webplayer/