On the mission where you must capture the main Norse base (the one where you can hear the Norse leaders thoughts) you begin with an unbuilt section of wall to the top right of your base used to teach you how to build and connect walls. If you go past...
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When you start the game and it takes you to the Lionhead Studios logo and all of those squares fall.Just click and you can drag the container thingy around. It shows you some pretty cool physics.