Prior to the release of Kid Icarus Uprising, many retailers were offering the original classic for free with preorder. Since then the title has remained an exclusive in the US, though this is no longer true. As of today, fans of the original can pick it up for $6 dollars off the eShop.
If you’re not a fan of Kid Icarus, then you can always give Pyramids a go. The demo was released with Kid Icarus and is a puzzle platformer about escaping a pyramid.