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Destroy yourself to win
When you beat enough rounds and levels, you begin to face orange-sailed ships that can leave craters in the ground (you have to build around these). There is a way to avoid these craters:
When the battle begins, destroy your castle walls before the orange-sailed ships can get a shot off. If your castle walls and cannons are destroyed, the ships will stop firing. Thus, no craters! This makes rebuilding MUCH easier. 'Survive' the levels, and you'll beat the game in no time...all in self-infliction!