Shell Challenge! Rules: DO NOT move or buldoze external walls. DO NOT bulldoze existing stairs, you can add railings and more stairs. DO NOT delete the pool. You can change the fences or add fences. You can place doors and windows where you want. You can build all the internal walls you want. You can decorate however you want. You can build external structures, like a greenhouse, pool or gazebo. You can make it residential or community lot. #shell #shellchallenge #decoration