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The Spiral Staircase is an unused map in all versions of Grandia intended to be part of the Twin Towers location. The map consists of a moving platform that rises up through a cylindrical tower that depicts what appears to be the history of creature evolution upon its walls. At the top of the tower is the entrance to the used map where Justin and Leen meet Liete .
- Towards the end of the evolution mural, we see what appears to be the development of humans or humanoids. After this, there is a further transition into shining embryonic creatures, which may depict ascension of humanoids into a higher form, such as the Spirits.