Demolish buildings in a physics based world, sounds easy doesn't it? Not when you must use careful planning to demolish exact objects.
Your goal is demolishing buildings which have on them or inside them, people or objects which have to remain intact after each explosion. The tow dotted lines indicate how high you edification is and how low it must be to make you able to pass level.
Use your mouse. Click on the block you want to explode. There are blocks that cannot be exploded. You have to restart level if: I) The neighbor buildings are hit; II) If the person or object inside or on you building is wounded.

Have fun!