Reply to Re: Sprite problem
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You could use invisible sprites with hardness and use them to add the hardness for the house; you can argue wether it should or shouldn't be used, but it works and generally you can do this without ever coming near the 99 sprite-limit. If you want to make a house hard, you could place invisible hard sprites near it. And one sprite can be made hard by setting its hardness to hard (like a man) 
