This is just an idea I got from SSIndustrial (p. 196) and a few other people. I liked the springs they had in their castles, so I made a spring using pcdebol's box design. All it does is bounce when you hit it with bombs. One thing you can do is see how many times you can hit it on top (making the springs bounce) with triple bomb shots before the triangles topple to the ground. My record is 61.
Spring-box Castle
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