Complete two veteran levels, such as the topmost and the leftmost battlefields. Press Left at the map screen, and the battlefield highlighting will disappear. Begin game play to start on the two player battlefields.
Enter the cannon stage. Attempt to place a cannon five times at a location that cannot accept a cannon. The firing stage will begin with the crosshairs directly over this location.
Clear old castle wall remnants by shooting them during the cannon stage.
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