The Straight-Base Series swing set is a great choice if your property is sloped or uneven. There is no need to spend money on costly landscaping services as these swing sets use a unique leveling system. Our original and most popular design, it offers more activity choices beneath the clubhouse than the Angled-Base Series. With little added expense, these cedar swing sets can accommodate a sandbox, since the standard ground supports hold the sand (optional covers sold separately). Other options include a built-in picnic table, and a completely enclosed bottom playhouse, with a floor and four walls.